# A346505 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 12 4 44 5 172 6 700 7 2940 8 12652 9 55500 10 247260 11 1115740 12 5088908 13 23423020 14 108659324 15 507520316 16 2384733868 17 11264884876 18 53464215580 19 254822253852 20 1219182031820 21 5853309920748 22 28190437248700 23 136160853462524 24 659401832797676 25 3201141695492172 26 15575294057678428