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A032118 Shifts left 2 places under "BIJ" (reversible, indistinct, labeled) transform. 1
1, 1, 1, 2, 7, 39, 282, 2476, 25468, 300104, 3984742, 58857048, 957156654, 16992957454, 327018332848, 6780662275976, 150700528101856, 3573879622264536, 90079771978313256, 2404666535666287000, 67774524657985373248, 2011157217480732750512, 62675350084052135287072 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..200

C. G. Bower, Transforms (2)

PROG

(PARI) BIJ(p)={(1-p^2/2)/(1-p) - 1}

seq(n)={my(p=x+O(x*x^(n%2))); for(i=1, n\2, p=intformal(1 + intformal(1 + BIJ(p)))); Vec(serlaplace(p))} \\ Andrew Howroyd, Sep 19 2018

CROSSREFS

Sequence in context: A121752 A054133 A266310 * A125660 A112944 A060073

Adjacent sequences:  A032115 A032116 A032117 * A032119 A032120 A032121

KEYWORD

nonn,eigen

AUTHOR

Christian G. Bower

EXTENSIONS

Terms a(21) and beyond from Andrew Howroyd, Sep 19 2018

STATUS

approved

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Last modified October 17 15:29 EDT 2018. Contains 316283 sequences. (Running on oeis4.)