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A026915
a(n) = T(n,0) + T(n,1) + ... + T(n,n), T given by A026907.
1
1, 26, 100, 272, 640, 1400, 2944, 6056, 12304, 24824, 49888, 100040, 200368, 401048, 802432, 1605224, 3210832, 6422072, 12844576, 25689608, 51379696, 102759896, 205520320, 411041192, 822082960, 1644166520, 3288333664, 6576667976, 13153336624, 26306673944
OFFSET
0,2
FORMULA
a(n) = 49*2^n - 24*n - 48.
a(n) = 4*a(n-1)-5*a(n-2)+2*a(n-3) for n>2. G.f.: (1+22*x+x^2) / ((1-x)^2*(1-2*x)). - Colin Barker, Feb 18 2016
PROG
(PARI) Vec((1+22*x+x^2)/((1-x)^2*(1-2*x)) + O(x^40)) \\ Colin Barker, Feb 18 2016
CROSSREFS
Sequence in context: A175549 A159541 A144129 * A136293 A065013 A031434
KEYWORD
nonn,easy
STATUS
approved