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

0,2

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

Crossrefs

Cf. A011782, A084858, A165241, A202480, A202481.

Sequence in context: A006857 A000478 A055848 * A200852 A266503 A058085

Adjacent sequences: A202490 A202491 A202492 * A202494 A202495 A202496

Keyword

nonn,easy

Author

Philippe Deléham, Dec 20 2011

Extensions

a(12) added by Bruno Berselli, Dec 21 2011

Status

approved