A172399 - OEIS

A172399

Expansion of x^7/(1-2*x-2*x^2+x^3+x^8).

1, 2, 6, 15, 40, 104, 273, 714, 1869, 4891, 12800, 33498, 87665, 229422, 600403, 1571271, 4112057, 10761362, 28162767, 73702703, 192881913, 504777043, 1321014806, 3457130514, 9047401540, 23677287940, 61964085679, 162161642995, 424381287495, 1110616998258

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OFFSET

7,2

LINKS

Table of n, a(n) for n=7..36.

Index entries for linear recurrences with constant coefficients, signature (2,2,-1,0,0,0,0,-1).

FORMULA

G.f.: x^7/(1-2*x-2*x^2+x^3+x^8).

MATHEMATICA

Drop[CoefficientList[Series[x^7/(1-2x-2x^2+x^3+x^8), {x, 0, 40}], x], 7] (* or *) LinearRecurrence[{2, 2, -1, 0, 0, 0, 0, -1}, {1, 2, 6, 15, 40, 104, 273, 714}, 30] (* Harvey P. Dale, May 05 2014 *)

CROSSREFS

Sequence in context: A246563 A259399 A307128 * A001654 A062106 A206000

Adjacent sequences: A172396 A172397 A172398 * A172400 A172401 A172402

KEYWORD

nonn,easy,less

AUTHOR

Roger L. Bagula, Nov 20 2010

STATUS

approved