A202493 Column k = 4 of triangular array in A165241.
1, 15, 105, 532, 2241, 8361, 28610, 91740, 279624, 818272, 2315712, 6372480, 17123840, 45082368, 116596224, 296879104, 745543680, 1849344000, 4536958976, 11020075008, 26526547968, 63329075200, 150057123840
Offset: 0
Links
- Vincenzo Librandi, Table of n, a(n) for n = 0..1000
- Index entries for linear recurrences with constant coefficients, signature (10,-40,80,-80,32).
Formula
a(n) = A165241(n+4,4).
G.f.: (1+5x-5x^2+2x^3+x^4-x^5)/(1-2x)^5.
a(n) = 2^n*(n+4)*(27*n^3+126*n^2+169*n+62)/256 for n>0. - Bruno Berselli, Dec 21 2011
Extensions
a(12) added by Bruno Berselli, Dec 21 2011