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A011908 [ n(n-1)(n-2)/26 ]. 0
0, 0, 0, 0, 0, 2, 4, 8, 12, 19, 27, 38, 50, 66, 84, 105, 129, 156, 188, 223, 263, 306, 355, 408, 467, 530, 600, 675, 756, 843, 936, 1037, 1144, 1259, 1380, 1510, 1647, 1793, 1946, 2109, 2280, 2460, 2649, 2847 (list; graph; refs; listen; history; internal format)
OFFSET

0,6

FORMULA

a(n) = +3*a(n-1) -3*a(n-2) +a(n-3) +a(n-13) -3*a(n-14) +3*a(n-15) -a(n-16). G.f.: x^5*(2-2*x+2*x^2-2*x^3+3*x^4-2*x^5+2*x^6-2*x^7+3*x^8-2*x^9+x^10) / ( (-1+x)^4*(1+x^12+x^11+x^10+x^9+x^8+x^7+x^6+x^5+x^4+x^3+x^2+x) ). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 15 2010]

CROSSREFS

Sequence in context: A125606 A192078 A136184 * A117455 A110571 A049696

Adjacent sequences:  A011905 A011906 A011907 * A011909 A011910 A011911

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 15 11:51 EST 2012. Contains 205778 sequences.