# A016228 (b-file synthesized from sequence entry) 0 1 1 12 2 103 3 774 4 5425 5 36456 6 238267 7 1527258 8 9651829 9 60352380 10 374321311 11 2306963022 12 14146953913 13 86407602384 14 526075008835 15 3194597025666 16 19358317017277 17 117103576420068 18 707389830102439 19 4268180838524790 20 25728294320699521 21 154965812371951032