Sha256: 1267c55a16f14e9173108467b61cf93d356067b4163636a8cecec4d71cca8a18
Contents?: true
Size: 304 Bytes
Versions: 5
Compression:
Stored size: 304 Bytes
Contents
# coding: utf-8
class Integer
def super_catalan
n = self
return 1 if n <= 2
Rational(
3 * ((2 * n) - 3) * (n - 1).super_catalan - (n - 3) * (n - 2).super_catalan,
n
).to_i
end
memoize :super_catalan
def super_catalan?
in_sequence?(seq: :super_catalan)
end
end
Version data entries
5 entries across 5 versions & 1 rubygems