# A334154 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 15 4 54 5 236 6 1254 7 7986 8 59584 9 509304 10 4897272 11 52237448 12 611460432 13 7787383488 14 107155194928 15 1583776282704 16 25019083516416 17 420609003810944 18 7496930998018176 19 141203784944996736 20 2802115237399913728 21 58432523737192745472 22 1277372108617847278848