A225490 Expansion of 1/(1 - x - x^2 + x^5 + x^6 - x^7).

1, 1, 2, 3, 5, 7, 10, 15, 21, 30, 42, 60, 84, 118, 166, 233, 327, 458, 643, 901, 1263, 1770, 2481, 3477, 4872, 6828, 9568, 13408, 18788, 26328, 36893, 51697, 72442, 101511, 142245, 199323, 279306, 391383, 548433

Offset: 0

Author

Roger L. Bagula, May 08 2013

Keywords

• nonn
• easy

Comments

Limiting ratio is 1.401268367939855..., the largest real root of -1 + x + x^2 - x^5 - x^6 + x^7.

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..1000
• Index entries for linear recurrences with constant coefficients, signature (1, 1, 0, 0, -1, -1, 1).

Crossrefs

Cf. A117791, A107293, A204631, A225391, A225482, A225484.

Programs

Mathematica

CoefficientList[Series[1/(1 - x - x^2 + x^5 + x^6 - x^7), {x, 0, 50}], x]