# A159322 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 2 4 6 5 12 6 62 7 280 8 2380 9 22400 10 321776 11 5837608 12 146558244 13 4938979584 14 221994255984 15 13767288844128 16 1127789953750020 17 129161855009676368 18 19561367056434877784 19 4170365129835922726384 20 1181440903578343187882844