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A027018
a(n) = T(2*n+1, n+3), T given by A027011.
1
1, 9, 150, 1085, 5283, 20495, 69007, 212020, 613633, 1708508, 4640978, 12414802, 32903418, 86731043, 227905816, 597838223, 1566763325, 4103989113, 10747219441, 28140274566, 73676929931, 192894712070, 505012447636, 1322149114676, 3461442847524, 9062189100301
OFFSET
2,2
FORMULA
G.f.: x^2*(1+103*x^2-30*x^3+69*x^4-73*x^5+34*x^6-9*x^7+x^8) / ((1-x)^6*(1-3*x+x^2)). - Colin Barker, Feb 19 2016
PROG
(PARI) Vec(x^2*(1+103*x^2-30*x^3+69*x^4-73*x^5+34*x^6-9*x^7+x^8)/((1-x)^6*(1-3*x+x^2)) + O(x^40)) \\ Colin Barker, Feb 19 2016
CROSSREFS
Sequence in context: A296017 A218350 A337672 * A326012 A089916 A143000
KEYWORD
nonn,easy
STATUS
approved