The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A228707 G.f.: (1-3*x+5*x^2-5*x^3+5*x^4-5*x^5+5*x^6-3*x^7+x^8)/((1-x)^4*(1+x^4)*(1+x^2)^2). 1
 1, 1, 1, 3, 6, 8, 10, 16, 24, 29, 35, 47, 61, 72, 84, 104, 127, 145, 165, 195, 228, 256, 286, 328, 374, 413, 455, 511, 571, 624, 680, 752, 829, 897, 969, 1059, 1154, 1240, 1330, 1440, 1556, 1661, 1771, 1903, 2041, 2168, 2300, 2456, 2619, 2769 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 E. Kirkman, J. Kuzmanovich and J. J. Zhang, Invariants of (-1)-Skew Polynomial Rings under Permutation Representations, arXiv preprint arXiv:1305.3973, 2013 FORMULA G.f.: (1-x+x^2)*(1-2 *x+2*x^2-x^3+2*x^4-2*x^5+x^6)/((1+x^2)^2*(1-x)^4*(1+x^4)). MATHEMATICA CoefficientList[Series[(1 - 3 x + 5 x^2 - 5 x^3 + 5 x^4 - 5 x^5 + 5 x^6 - 3 x^7 + x^8) / ((1 - x)^4 (1 + x^4) (1 + x^2)^2), {x, 0, 50}], x] (* Vincenzo Librandi, Sep 07 2013 *) PROG (MAGMA) m:=50; R:=PowerSeriesRing(Integers(), m); Coefficients(R!((1-3*x+5*x^2-5*x^3+5*x^4-5*x^5+5*x^6-3*x^7+x^8)/((1-x)^4*(1+x^4)*(1+x^2)^2))); // Vincenzo Librandi, Sep 07 2013 CROSSREFS Cf. A032279, A228706. Sequence in context: A121741 A343409 A043549 * A290218 A310135 A124051 Adjacent sequences:  A228704 A228705 A228706 * A228708 A228709 A228710 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, Sep 06 2013 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 12 10:58 EDT 2021. Contains 344947 sequences. (Running on oeis4.)