A032105 Number of series-reduced dyslexic identity planted planar trees with n leaves of 2 colors.

2, 1, 4, 19, 92, 468, 2470, 13394, 74296, 419463, 2403502, 13941202, 81707264, 483131437, 2878697568, 17267416917, 104186446502, 631913206482, 3850548301808, 23561351983192, 144715120126370

Offset

1,1

Links

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

Index entries for sequences related to rooted trees

C. G. Bower, Transforms (2)

Formula

Doubles (index 2+) under "BHK" (reversible, identity, unlabeled) transform.

Prog

(PARI)
BHK(p)={p + (1/(1-p) - (1+p)/subst(1-p, x, x^2))/2}
seq(n)={my(p=2*x); for(i=2, n, p+=x^i*polcoeff(BHK(p) + O(x*x^i), i)); Vecrev(p/x)} \\ Andrew Howroyd, Aug 30 2018

Crossrefs

Sequence in context: A012930 A013162 A010252 * A259472 A354055 A053565

Adjacent sequences: A032102 A032103 A032104 * A032106 A032107 A032108

Keyword

nonn

Author

Christian G. Bower

Status

approved