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A001256 Squares of numbers of trees. 1
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 (list; graph; refs; listen; history; text; internal format)
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 * A227253 A029997 A118548

Adjacent sequences:  A001253 A001254 A001255 * A001257 A001258 A001259

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified November 18 02:02 EST 2019. Contains 329242 sequences. (Running on oeis4.)