A024878 a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers >= 3), t = (F(2), F(3), F(4), ...).

6, 9, 27, 44, 96, 155, 299, 484, 874, 1414, 2456, 3974, 6736, 10899, 18185, 29424, 48588, 78617, 128933, 208618, 340580, 551070, 896928, 1451260, 2357338, 3814253, 6187383

Offset

2,1

Links

Table of n, a(n) for n=2..28.

Formula

G.f.: x^2*(1+x)*(2*x^6+4*x^4+x^3-3*x^2+3*x-6)/ ((x^2+x-1) * (x^4+x^2-1)^2) [From Maksym Voznyy (voznyy(AT)mail.ru), Jul 28 2009]

Crossrefs

Sequence in context: A115644 A243708 A300345 * A007414 A274977 A340630

Adjacent sequences: A024875 A024876 A024877 * A024879 A024880 A024881

Keyword

nonn

Author

Clark Kimberling

Status

approved