OFFSET
0,4
REFERENCES
A. T. Benjamin and J. J. Quinn, Proofs that really count: the art of combinatorial proof, M.A.A. 2003
FORMULA
MATHEMATICA
Binomial[n, 2]Fibonacci[n + 2] - n Fibonacci[n + 3] + Fibonacci[n + 5] - 5
PROG
(PARI) a(n) = sum(k=2, n, k*(k-1)*fibonacci(k)/2); \\ Michel Marcus, Feb 28 2019
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Mitch Harris, Feb 28 2006
STATUS
approved