# A148656 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 6 4 24 5 64 6 234 7 773 8 2834 9 9831 10 37010 11 136510 12 515786 13 1945824 14 7551398 15 28998957 16 113230854 17 443548687 18 1754250827 19 6920531600 20 27637345567 21 110388869744 22 443391403250 23 1783214166259 24 7222153140203 25 29236895471647 26 118939528499130 27 484637762074954 28 1982394583968022