A245090 Number of 2n-node rooted identity trees of height n.

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

Alois P. Heinz, Table of n, a(n) for n = 0..125

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

Adjacent sequences: A245087 A245088 A245089 * A245091 A245092 A245093

Keyword

nonn

Author

Alois P. Heinz, Jul 11 2014

Status

approved