# A012594 (b-file synthesized from sequence entry) 0 1 1 0 2 1 3 6 4 25 5 140 6 1225 7 11410 8 110353 9 1260696 10 16597745 11 233501598 12 3534940649 13 58867014180 14 1060745261433 15 20315286728490 16 414362268698017 17 9016753267197744 18 207836963025430369 19 5046234392527982902