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A054136 T(n,2), array T as in A054134. 0
2, 6, 18, 46, 107, 235, 498, 1032, 2109, 4273, 8612, 17302, 34695, 69495, 139110, 278356, 556865, 1113901, 2227992, 4456194, 8912619, 17825491, 35651258, 71302816, 142605957, 285212265, 570424908, 1140850222, 2281700879 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..30.

FORMULA

G.f.: x^2(x^4-4x^3+6x^2-4x+2)/[(1-2x)(1-x)^3].

CROSSREFS

Sequence in context: A120414 A251685 A308305 * A232600 A140960 A072827

Adjacent sequences:  A054133 A054134 A054135 * A054137 A054138 A054139

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified August 7 15:08 EDT 2020. Contains 336276 sequences. (Running on oeis4.)