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A063396
T(3,n) with T(n,m) as in A063394.
4
1, 15, 47, 131, 343, 863, 2111, 5055, 11903, 27647, 63487, 144383, 325631, 729087, 1622015, 3588095, 7897087, 17301503, 37748735, 82051071, 177733631, 383778815, 826277887, 1774190591, 3800039423, 8120172543, 17314086911, 36842766335, 78248935423
OFFSET
0,2
FORMULA
For n>0, 1/4 * [(n+1)(n+2)2^n + 10(n+1)2^n + 6*2^n - 4]. - Ralf Stephan, May 08 2004
G.f.: -(20*x^4-52*x^3+40*x^2-8*x-1) / ((x-1)*(2*x-1)^3). - Colin Barker, May 27 2015
MATHEMATICA
Join[{1}, LinearRecurrence[{7, -18, 20, -8}, {15, 47, 131, 343}, 30]] (* Harvey P. Dale, Jul 31 2014 *)
PROG
(PARI) Vec(-(20*x^4-52*x^3+40*x^2-8*x-1)/((x-1)*(2*x-1)^3) + O(x^100)) \\ Colin Barker, May 27 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Floor van Lamoen, Jul 16 2001
STATUS
approved