# A105072 (b-file synthesized from sequence entry) 1 1 2 2 3 5 4 16 5 63 6 290 7 1511 8 8756 9 55761 10 386394 11 2889181 12 23152104 13 197714479 14 1790887562 15 17136276943 16 172602398812 17 1824364931681 18 20179983080754 19 233031648587509 20 2803140527987776 21 35055393201882847 22 454955691827090802