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A051263
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Expansion of 1/((1-x)*(1-x^3)^2*(1-x^5)).
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3
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1, 1, 1, 3, 3, 4, 7, 7, 9, 13, 14, 17, 22, 24, 28, 35, 38, 43, 52, 56, 63, 74, 79, 88, 101, 108, 119, 134, 143, 156, 174, 185, 200, 221, 234, 252, 276, 291, 312, 339, 357, 381, 411, 432, 459, 493, 517, 547, 585, 612, 646, 688, 718, 756, 802, 836, 878, 928, 966
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OFFSET
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0,4
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COMMENTS
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A two-way infinite sequences which is palindromic (up to sign). - Michael Somos, Mar 21 2003
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LINKS
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Index entries for linear recurrences with constant coefficients, signature (1, 0, 2, -2, 1, -2, 1, -2, 2, 0, 1, -1).
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FORMULA
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G.f.: 1 / ((1 - x) * (1 - x^3)^2 * (1 - x^5)).
a(-12 - n) = -a(n). a(n) = a(n-1) + 2*a(n-3) - 2*a(n-4) + a(n-5) - 2*a(n-6) + a(n-7) - 2*a(n-8) + 2*a(n-9) + a(n-11) - a(n-12). - Michael Somos, Mar 21 2003
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PROG
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(PARI) {a(n) = if( n<-11, -a(-12 - n), if( n<0, 0, polcoeff( 1 / ((1 - x) * (1 - x^3)^2 * (1 - x^5)) + x * O(x^n), n)))} /* Michael Somos, Mar 21 2003 */
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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