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A245090
Number of 2n-node rooted identity trees of height n.
3
0, 1, 1, 2, 8, 34, 149, 672, 3078, 14232, 66278, 310408, 1460390, 6896417, 32668860, 155166468, 738679240, 3523549192, 16837094932, 80580576022, 386187326865, 1853144445292, 8902504243912, 42811658101548, 206072505914938, 992778384676916, 4786621055083592
OFFSET
0,4
LINKS
FORMULA
a(n) = A227819(2n,n).
a(n) ~ c * d^n / sqrt(n), where d = 4.9159375028212..., c = 0.025641919495... . - Vaclav Kotesovec, Jul 12 2014
CROSSREFS
Cf. A227819.
Sequence in context: A296227 A034999 A067336 * A151829 A026387 A085362
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Jul 11 2014
STATUS
approved