A020129 Ceiling of Gamma(n+2/5)/Gamma(2/5).

1, 1, 1, 2, 5, 21, 109, 695, 5143, 43194, 406017, 4222570, 48137292, 596902409, 7998492274, 115178288737, 1773745646540, 29089428603256, 506156057696642, 9313271461618196, 180677466355392996, 3685820313650017112, 78876554712110366181, 1766834825551272202440, 41343934917899769537074

Offset

0,4

Links

Paolo Xausa, Table of n, a(n) for n = 0..400

Maple

Digits := 64:f := proc(n, x) ceil(GAMMA(n+x)/GAMMA(x)); end;

Mathematica

Ceiling[Pochhammer[2/5, Range[0, 25]]] (* Paolo Xausa, Jan 15 2026 *)

Crossrefs

Cf. A020039, A020084.

Sequence in context: A002628 A370656 A357919 * A129582 A152576 A328286

Adjacent sequences: A020126 A020127 A020128 * A020130 A020131 A020132

Keyword

nonn

Author

Simon Plouffe

Extensions

More terms from Paolo Xausa, Jan 15 2026

Status

approved