# A037613 (b-file synthesized from sequence entry) 1 1 2 9 3 56 4 337 5 2025 6 12152 7 72913 8 437481 9 2624888 10 15749329 11 94495977 12 566975864 13 3401855185 14 20411131113 15 122466786680 16 734800720081 17 4408804320489 18 26452825922936 19 158716955537617 20 952301733225705 21 5713810399354232