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A027013 a(n) = T(2*n, n+2), T given by A027011. 1
1, 8, 107, 654, 2801, 9859, 30869, 89951, 250780, 680665, 1818310, 4813018, 12674542, 33283434, 87272241, 228658744, 598864479, 1568137061, 4105798635, 10749568905, 28143285770, 73680744203, 192899492252, 505018380164, 1322156411756, 3461451749404 (list; graph; refs; listen; history; text; internal format)
OFFSET
2,2
LINKS
FORMULA
G.f.: x^2*(1+69*x^2-39*x^3+36*x^4-26*x^5+8*x^6-x^7) / ((1-x)^5*(1-3*x+x^2)). - Colin Barker, Feb 19 2016
MATHEMATICA
LinearRecurrence[{8, -26, 45, -45, 26, -8, 1}, {1, 8, 107, 654, 2801, 9859, 30869, 89951}, 30] (* Harvey P. Dale, Oct 08 2018 *)
PROG
(PARI) Vec(x^2*(1+69*x^2-39*x^3+36*x^4-26*x^5+8*x^6-x^7)/((1-x)^5*(1-3*x+x^2)) + O(x^40)) \\ Colin Barker, Feb 19 2016
CROSSREFS
Sequence in context: A345474 A000845 A199658 * A365818 A239985 A274892
KEYWORD
nonn,easy
AUTHOR
STATUS
approved

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Last modified April 20 12:36 EDT 2024. Contains 371844 sequences. (Running on oeis4.)