How to resolve the algorithm Riordan numbers step by step in the Raku programming language
Published on 12 May 2024 09:40 PM
How to resolve the algorithm Riordan numbers step by step in the Raku programming language
Table of Contents
Problem Statement
Riordan numbers show up in several places in set theory. They are closely related to Motzkin numbers, and may be used to derive them. Riordan numbers comprise the sequence a where: There are other generating functions, and you are free to use one most convenient for your language.
Let's start with the solution:
Step by Step solution about How to resolve the algorithm Riordan numbers step by step in the Raku programming language
Source code in the raku programming language
use Lingua::EN::Numbers;
my @riordan = 1, 0, { state $n = 1; (++$n - 1) / ($n + 1) × (3 × $^a + 2 × $^b) } … *;
my $upto = 32;
say "First {$upto.&cardinal} Riordan numbers:\n" ~ @riordan[^$upto]».&comma».fmt("%17s").batch(4).join("\n") ~ "\n";
sub abr ($_) { .chars < 41 ?? $_ !! .substr(0,20) ~ '..' ~ .substr(*-20) ~ " ({.chars} digits)" }
say "The {.Int.&ordinal}: " ~ abr @riordan[$_ - 1] for 1e3, 1e4
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