# A193620 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 22 4 132 5 875 6 6127 7 44580 8 333748 9 2553956 10 19887080 11 157066758 12 1255181598 13 10130663492 14 82461801961 15 676165571433 16 5580011570160 17 46309238031602 18 386256008451734 19 3236134144224075 20 27222318068596831 21 229828039356161276 22 1946773238298955438