A051052 a(n) = binomial(n, floor(n/5)).

1, 1, 1, 1, 1, 5, 6, 7, 8, 9, 45, 55, 66, 78, 91, 455, 560, 680, 816, 969, 4845, 5985, 7315, 8855, 10626, 53130, 65780, 80730, 98280, 118755, 593775, 736281, 906192, 1107568, 1344904, 6724520, 8347680, 10295472, 12620256, 15380937, 76904685

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Links

• Seiichi Manyama, Table of n, a(n) for n = 0..1000

Crossrefs

Cf. A001405, A051033, A051036, A051053, A062947.

Programs

Mathematica

Table[Binomial[n,Floor[n/5]],{n,0,40}] (* Harvey P. Dale, Aug 06 2017 *)