# A055900 (b-file synthesized from sequence entry) 4 1 5 9 6 51 7 209 8 696 9 1980 10 5000 11 11475 12 24375 13 48545 14 91581 15 164934 16 285376 17 476784 18 772416 19 1217610 20 1873125 21 2819025 22 4159375 23 6027615 24 8592936 25 12067484 26 16714776 27 22859109 28 30896411 29 41306265 30 54665625 31 71663900