A129988 Fourth differences of A129983.

1, 2, 4, 9, 20, 44, 96, 209, 456, 999, 2198, 4854, 10752, 23877, 53142, 118517, 264816, 592744, 1328880, 2983565, 6707396, 15096727, 34014866, 76712042, 173150400, 391119273, 884066890, 1999489733, 4524624820, 10243526452, 23200473632

Offset

0,2

Links

Table of n, a(n) for n=0..30.

Formula

a(n) = +6*a(n-1) -13*a(n-2) +12*a(n-3) -3*a(n-4) -2*a(n-5), n>5. - R. J. Mathar, Feb 11 2016

Crossrefs

Cf. A129983.

Sequence in context: A109975 A129891 A130587 * A035530 A350325 A141016

Adjacent sequences: A129985 A129986 A129987 * A129989 A129990 A129991

Keyword

nonn,easy

Author

Paul Curtz, Jun 14 2007

Status

approved