# A218306 (b-file synthesized from sequence entry) 0 1 1 2 2 20 3 392 4 11648 5 466112 6 23517824 7 1434077696 8 102618951680 9 8432793964544 10 782753794531328 11 81007725700038656 12 9249066952457584640 13 1154952975718091325440 14 156588371428134115868672 15 22908199202756436344963072 16 3597006040171205977538822144