A102428 Central column of triangle A102427.

1, 3, 6, 28, 55, 286, 560, 3060, 5985, 33649, 65780, 376740, 736281, 4272048, 8347680, 48903492, 95548245, 563921995, 1101716330, 6540715896, 12777711870, 76223753060, 148902215280, 891794789340, 1742058970275, 10468434365991

Offset

0,2

Links

Table of n, a(n) for n=0..25.

Formula

a(n) = binomial(floor((5*n+2)/2), floor((n+1)/2)). - David Wasserman, Apr 04 2008

Mathematica

Table[Binomial[Floor[(5n+2)/2], Floor[(n+1)/2]], {n, 0, 30}] (* Harvey P. Dale, Mar 13 2015 *)

Crossrefs

Cf. A011973, A102426, A102427, A102429.

Sequence in context: A085076 A076711 A075088 * A128056 A068808 A068133

Adjacent sequences: A102425 A102426 A102427 * A102429 A102430 A102431

Keyword

nonn

Author

Russell Walsmith, Jan 11 2005

Extensions

More terms from David Wasserman, Apr 04 2008

Status

approved