# A006225 (b-file synthesized from sequence entry) 0 0 1 1 2 3 3 13 4 55 5 445 6 7121 7 113947 8 3646325 9 99147089 10 2050446459 11 125018193357 12 5616378432777 13 30417995237783 14 6566814307004221 15 383349575034664217 16 5168339287595575151 17 549730084897741831651 18 22737447826678001578373