Riordan numbers: Difference between revisions

=={{header|Julia}}==

{{trans|Python}}

<syntaxhighlight lang="julia">""" julia example for rosettacode.org/wiki/Riordan_number """

using Formatting

const riordans = zeros(BigInt, 10000)

riordans[begin] = 1

for i in firstindex(riordans)+1:lastindex(riordans)-1

riordans[i + 1] = (i - 1) * (2 * riordans[i] + 3 * riordans[i - 1]) ÷ (i + 1)

end

for i in 0:31

print(rpad(format(riordans[begin+i], commas = true), 18), (i + 1) % 4 == 0 ? "\n" : "")

end

println("\nThe 1,000th Riordan has $(length(string(riordans[1000]))) digits.")

println("The 10,000th Riordan has $(length(string(riordans[10_000]))) digits.")

</syntaxhighlight>{{out}}

<pre>

1 0 1 1

3 6 15 36

91 232 603 1,585

4,213 11,298 30,537 83,097

227,475 625,992 1,730,787 4,805,595

13,393,689 37,458,330 105,089,229 295,673,994

834,086,421 2,358,641,376 6,684,761,125 18,985,057,351

54,022,715,451 154,000,562,758 439,742,222,071 1,257,643,249,140

The 1,000th Riordan has 472 digits.

The 10,000th Riordan has 4765 digits.

</pre>