# A245138 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 13 4 49 5 361 6 3121 7 39733 8 409249 9 6410641 10 91979041 11 1716516253 12 29795642449 13 660718214521 14 13656276138961 15 345794520085573 16 8290832204163649 17 237409681243284001 18 6465138777774530881 19 206263448435258395693 20 6296129943088315156849 21 221484543685548532051081