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 A026975 a(n) = Sum_{k=0..n} (k+1) * A026648(n,k). 0
 1, 3, 10, 25, 66, 154, 392, 882, 2180, 4796, 11640, 25220, 60424, 129480, 307264, 652936, 1538064, 3247024, 7604000, 15968400, 37217312, 77818016, 180652416, 376359200, 870795328, 1808574912, 4172640640, 8643327040 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS FORMULA Conjectures from Colin Barker, Feb 18 2016: (Start) a(n) = 8*a(n-2)-12*a(n-4)-16*a(n-6)-4*a(n-8) for n>7. G.f.: (1+3*x+2*x^2+x^3-2*x^4-10*x^5-2*x^7) / (1-4*x^2-2*x^4)^2. (End) CROSSREFS Sequence in context: A176610 A026965 A130783 * A296668 A026985 A319919 Adjacent sequences:  A026972 A026973 A026974 * A026976 A026977 A026978 KEYWORD nonn AUTHOR STATUS approved

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Last modified May 17 13:24 EDT 2022. Contains 353746 sequences. (Running on oeis4.)