# A061557 (b-file synthesized from sequence entry) 1 3 2 8 3 23 4 70 5 222 6 726 7 2431 8 8294 9 28730 10 100776 11 357238 12 1277788 13 4605980 14 16715250 15 61020495 16 223931910 17 825632610 18 3056887680 19 11360977650 20 42368413620 21 158498860260 22 594636663660 23 2236748680998 24 8433988655580