# A026077 (b-file synthesized from sequence entry) 1 1 2 6 3 40 4 232 5 1352 6 7854 7 45683 8 266214 9 1554684 10 9098740 11 53357985 12 313495934 13 1845063496 14 10876094870 15 64203285600 16 379498497900 17 2245861126596 18 13305537121404 19 78907795361228 20 468393492593496