login
A202481
Column k = 3 of triangular array in A165241.
2
1, 10, 55, 231, 833, 2720, 8280, 23920, 66352, 178176, 465920, 1191680, 2991360, 7389184, 17999872, 43315200, 103116800, 243138560, 568393728, 1318518784, 3037265920, 6952058880, 15820390400, 35809918976, 80659611648
OFFSET
0,2
FORMULA
G.f.: (1+2x-x^2-x^3+x^4)/(1-2x)^4.
a(n) = A165241(n+3,3).
a(n) = 2^n*(n+3)*(3*n+2)*(3*n+5)/32 for n>0. - Bruno Berselli, Dec 21 2011
MATHEMATICA
LinearRecurrence[{8, -24, 32, -16}, {1, 10, 55, 231, 833}, 30] (* Harvey P. Dale, Dec 04 2018 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Philippe Deléham, Dec 20 2011
STATUS
approved