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A011928 a(n) = floor(n(n-1)(n-2)(n-3)/18). 0
0, 0, 0, 0, 1, 6, 20, 46, 93, 168, 280, 440, 660, 953, 1334, 1820, 2426, 3173, 4080, 5168, 6460, 7980, 9753, 11806, 14168, 16866, 19933, 23400, 27300, 31668, 36540, 41953, 47946, 54560, 61834, 69813, 78540, 88060, 98420, 109668, 121853, 135026, 149240 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

LINKS

Table of n, a(n) for n=0..42.

MATHEMATICA

Table[Floor[n(n - 1)(n - 2)(n - 3)/18], {n, 0, 50}] (* Stefan Steinerberger, Apr 25 2006 *)

CROSSREFS

Sequence in context: A225269 A048969 A005564 * A055455 A203552 A050768

Adjacent sequences:  A011925 A011926 A011927 * A011929 A011930 A011931

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from Stefan Steinerberger, Apr 25 2006

STATUS

approved

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Last modified December 12 22:06 EST 2019. Contains 329963 sequences. (Running on oeis4.)