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