# A068199 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 24 4 114 5 618 6 3732 7 24702 8 177126 9 1363740 10 11195286 11 97437138 12 894857712 13 8637708858 14 87333790686 15 922203924216 16 10144109299146 17 115972625504994 18 1375221840671220 19 16884112119546534 20 214270296662325534 21 2806600053170775372 22 37892025089041181982