A024861 a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers), t = (F(2), F(3), F(4), ... ).

2, 3, 11, 18, 44, 71, 147, 238, 450, 728, 1304, 2110, 3652, 5909, 10001, 16182, 26984, 43661, 72085, 116636, 191284, 309504, 505312, 817612, 1330854, 2153367, 3498039, 5659946, 9181940

Offset

2,1

Links

Table of n, a(n) for n=2..30.

Formula

G.f.:(-2-x^4-2*x^3-2*x^2-x)/((x^2+x-1)*(x^4+x^2-1)^2) [From Maksym Voznyy (voznyy(AT)mail.ru), Jul 27 2009]

Crossrefs

Sequence in context: A263932 A267420 A322422 * A025101 A025105 A257979

Adjacent sequences: A024858 A024859 A024860 * A024862 A024863 A024864

Keyword

nonn

Author

Clark Kimberling

Status

approved