A219462 - OEIS

A219462

a(n) = Sum_{k = 1..2*n} binomial(2*n,k) * Fibonacci(2*k).

0, 5, 75, 1000, 13125, 171875, 2250000, 29453125, 385546875, 5046875000, 66064453125, 864794921875, 11320312500000, 148184814453125, 1939764404296875, 25391845703125000, 332383575439453125, 4350957489013671875, 56954772949218750000, 745547657012939453125

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 0..500

Doron Zeilbeger, An Enquiry Concerning Human (and Computer!) [Mathematical] Understanding, (2007); page 10.

Index entries for linear recurrences with constant coefficients, signature (15,-25).

FORMULA

a(n) = Sum_{k=1..n} A034870(n,k)*A001906(k).

a(n) = 5^n * Fibonacci(2*n) = A000351(n) * A001906(n).

G.f.: 5*x/(25*x^2-15*x+1). - Colin Barker, Dec 03 2012

E.g.f.: 2*exp(15*x/2)*sinh(5*sqrt(5)*x/2)/sqrt(5). - Stefano Spezia, Oct 19 2023