A283679 G.f.: F(F(F(x))) where F(x) = x/(1-x-x^2) is the g.f. for the Fibonacci numbers.

0, 1, 3, 12, 48, 197, 815, 3391, 14153, 59185, 247791, 1038186, 4351706, 18245861, 76514483, 320899470, 1345931153, 5645394769, 23679726926, 99326654214, 416638208001, 1747652017025, 7330817809523, 30750407615699, 128988186902345, 541064919671773, 2269598571509748, 9520261251293028

Offset: 0

Author

Oboifeng Dira, Mar 14 2017

Keywords

• nonn
• easy

Programs

Maple

f:= x-> x/(1-x-x^2):
a:= n-> coeff(series(f(f(f(x))), x, n+1), x, n):
seq(a(n), n=0..23);

Extensions

Edited by N. J. A. Sloane, Apr 21 2017