# A149918 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 15 4 47 5 155 6 550 7 2035 8 7722 9 29985 10 118765 11 479168 12 1964860 13 8163456 14 34289654 15 145407531 16 622140088 17 2684352052 18 11668740663 19 51051121400 20 224634027148 21 993743689121 22 4418607853426 23 19739660278386 24 88559523924740 25 398844406130059 26 1802754697899622 27 8176336856042439