# A000427 (b-file synthesized from sequence entry) 1 1 2 8 3 36 4 148 5 554 6 2024 7 7134 8 24796 9 84625 10 285784 11 953430 12 3151332 13 10314257 14 33457972 15 107557792 16 342732670 17 1082509680 18 3389190112 19 10518508294 20 32361863632