A001256 Squares of numbers of trees.

1, 1, 1, 1, 4, 9, 36, 121, 529, 2209, 11236, 55225, 303601, 1692601, 9979281, 59923081, 373262400, 2364779641, 15343033689, 101095382025, 677435994225, 4598901695025, 31626631547536, 219871778549476, 1544481904210609, 10948878748872100, 78284374662902500

Offset

0,5

Links

Alois P. Heinz, Table of n, a(n) for n = 0..1000

Index entries for sequences related to trees

Formula

a(n) = A000055(n)^2.

Crossrefs

Cf. A000055.

Sequence in context: A149144 A149145 A262473 * A372211 A227253 A029997

Adjacent sequences: A001253 A001254 A001255 * A001257 A001258 A001259

Keyword

nonn

Author

N. J. A. Sloane

Status

approved