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A054128
T(n,2), array T as in A054126.
0
2, 7, 24, 68, 171, 398, 880, 1880, 3925, 8070, 16426, 33216, 66887, 134334, 269348, 539512, 1079993, 2161126, 4323582, 8648704, 17299179, 34600382, 69203064, 138408728, 276820381, 553644038, 1107291730, 2214587520
OFFSET
2,1
FORMULA
G.f.: x^2(-x^5+5x^4-10x^3+10x^2-5x+2)/[(1-2x)(1-x)^4].
CROSSREFS
Sequence in context: A022497 A358655 A258341 * A082047 A370306 A341803
KEYWORD
nonn
STATUS
approved