# A224073 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 1 4 3 5 4 6 10 7 16 8 43 9 101 10 340 11 911 12 2544 13 7224 14 22616 15 65376 16 187754 17 545743 18 1653966 19 4832057 20 14027794