# A047023 (b-file synthesized from sequence entry) 1 1 2 1 3 4 4 5 5 19 6 66 7 293 8 1144 9 4308 10 17158 11 67007 12 258431 13 1012299 14 3955448 15 15396192 16 60225003 17 235693679 18 921621773 19 3610690891 20 14157362951 21 55517613242 22 217923561656 23 856025426013 24 3363897769426 25 13227528604439