# A117588 (b-file synthesized from sequence entry) 1 2 2 6 3 8 4 14 5 20 6 90 7 102 8 154 9 228 10 310 11 418 12 554 13 1070 14 1224 15 3144 16 3996 17 4464 18 16194 19 17096 20 36642