# A299293 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 7 4 17 5 31 6 80 7 152 8 404 9 790 10 2140 11 4271 12 11729 13 23767 14 65952 15 135221 16 378321 17 782968 18 2205168 19 4598804 20 13023324 21 27332956 22 77761008