# A146688 (b-file synthesized from sequence entry) 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 15 9 35 10 63 11 133 12 361 13 1225 14 3603 15 14173 16 68577 17 327107 18 1804859 19 9535581 20 56798795 21 377223653