# A243694 (b-file synthesized from sequence entry) 0 1 1 1 2 6 3 45 4 382 5 3498 6 33696 7 336549 8 3453750 9 36197694 10 385817700 11 4169274354 12 45573898860 13 503014992340 14 5598239469972 15 62754598454805 16 707899472049702 17 8029846915852662 18 91534356644739300 19 1048036064453687814 20 12047350849047152388 21 138984261578842304268