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A032104 Shifts left 2 places under "BHK" (reversible, identity, unlabeled) transform. 1
1, 1, 1, 1, 2, 3, 8, 16, 40, 89, 214, 498, 1194, 2849, 6890, 16706, 40820, 100134, 246930, 611215, 1518972, 3787278, 9473250, 23762348, 59763611, 150670704, 380716008, 963993526, 2445626469, 6215681848, 15824165262 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

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

C. G. Bower, Transforms (2)

Index entries for sequences related to rooted trees

PROG

(PARI)

BHK(p)={p + (1/(1-p) - (1+p)/subst(1-p, x, x^2))/2}

seq(n)={my(p=1+O(x^(n%2))); for(i=1, n\2, p=1+x+x*BHK(x*p)); Vec(p)} \\ Andrew Howroyd, Aug 30 2018

CROSSREFS

Sequence in context: A219751 A121133 A011952 * A051573 A292853 A204516

Adjacent sequences:  A032101 A032102 A032103 * A032105 A032106 A032107

KEYWORD

nonn,eigen

AUTHOR

Christian G. Bower

STATUS

approved

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Last modified October 17 22:48 EDT 2018. Contains 316297 sequences. (Running on oeis4.)