A024858 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 = (Lucas numbers).

3, 4, 15, 25, 61, 98, 203, 329, 622, 1006, 1802, 2916, 5047, 8166, 13821, 22363, 37291, 60338, 99619, 161187, 264348, 427724, 698324, 1129912, 1839195, 2975880, 4834171, 7821853

Offset

2,1

Links

Table of n, a(n) for n=2..29.

Formula

G.f.:(-3+x^5-2*x^4-4*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: A086826 A081405 A167367 * A293047 A135100 A205485

Adjacent sequences: A024855 A024856 A024857 * A024859 A024860 A024861

Keyword

nonn

Author

Clark Kimberling

Status

approved