A001257 Squares of numbers of rooted trees.

1, 1, 4, 16, 81, 400, 2304, 13225, 81796, 516961, 3392964, 22714756, 155900196, 1087218729, 7710771721, 55404215161, 403030713409, 2962388303281, 21983682632976, 164512124707984, 1240577449436224

Offset

0,3

Links

Table of n, a(n) for n=0..20.

Index entries for sequences related to rooted trees

Crossrefs

Cf. A000081.

Sequence in context: A280923 A118997 A337839 * A133053 A342326 A110378

Adjacent sequences: A001254 A001255 A001256 * A001258 A001259 A001260

Keyword

nonn

Author

N. J. A. Sloane

Status

approved