# A107591 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 22 5 91 6 408 7 1939 8 9635 9 49614 10 263140 11 1431301 12 7959568 13 45152340 14 260847526 15 1532825675 16 9154581802 17 55537885743 18 342147577227 19 2140251570508 20 13594688301758 21 87702596534110 22 574815620158265 23 3829029514213952