# A057971 (b-file synthesized from sequence entry) 2 2 3 18 4 133 5 873 6 5182 7 27786 8 135370 9 602454 10 2466628 11 9358497 12 33134431 13 110184932 14 346141949 15 1032550097 16 2938104492 17 8006865684 18 20971632456 19 52958252851 20 129291697111 21 305924724070 22 703108665327 23 1572722761341