# A215072 (b-file synthesized from sequence entry) 1 1 2 1 3 2 4 4 5 12 6 40 7 153 8 638 9 2825 10 12938 11 60458 12 285664 13 1358283 14 6480694 15 30979999 16 148249768 17 709832688 18 3399805736 19 16286469156 20 78026226228 21 373832145200 22 1791120945112