A341855 Number of nonseparable trivalent maps with n nodes up to orientation preserving automorphisms.

1, 2, 4, 20, 93, 554, 3554, 24256, 171676, 1255194, 9399396, 71837656, 558420702, 4404369524, 35176227916, 284034186632, 2315677128324, 19041443086870, 157775390173844, 1316314747361426, 11050281929647605, 93289306725561418, 791625463473512860, 6749144798353446552

Offset

3,2

Links

Table of n, a(n) for n=3..26.

Crossrefs

Antidiagonal sums of A262586.

Cf. A005027, A005028.

Sequence in context: A188326 A158094 A108879 * A337038 A058006 A153229

Adjacent sequences: A341852 A341853 A341854 * A341856 A341857 A341858

Keyword

nonn

Author

Andrew Howroyd, Feb 22 2021

Status

approved