A032104 Shifts left 2 places under "BHK" (reversible, identity, unlabeled) transform.

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

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 A363204

Adjacent sequences: A032101 A032102 A032103 * A032105 A032106 A032107

Keyword

nonn,eigen

Author

Christian G. Bower

Status

approved