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A245102 Number of 2n-node rooted trees of height n. 3
0, 1, 2, 8, 36, 180, 941, 5079, 27961, 156129, 880883, 5009625, 28668920, 164897622, 952418882, 5520254925, 32090787577, 187030223470, 1092467751427, 6393706661582, 37484034980109, 220093799592140, 1294100839792723, 7618482099893824, 44901233075819275 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..200

FORMULA

a(n) = A034781(2n,n).

a(n) ~ c * d^n / sqrt(n), where d = 6.0313827950978605329935..., c = 0.03944957121899527... . - Vaclav Kotesovec, Jul 12 2014

CROSSREFS

Cf. A034781.

Sequence in context: A109318 A113327 A227791 * A129148 A285672 A081958

Adjacent sequences:  A245099 A245100 A245101 * A245103 A245104 A245105

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Jul 11 2014

STATUS

approved

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Last modified October 16 06:24 EDT 2019. Contains 328049 sequences. (Running on oeis4.)