# A149368 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 12 4 45 5 161 6 651 7 2575 8 10768 9 44901 10 193043 11 833057 12 3653939 13 16134813 14 71923457 15 322774583 16 1457954685 17 6622090289 18 30234131093 19 138642032594 20 638494794892 21 2951054790813 22 13687439364362 23 63680571279683 24 297128054833522 25 1390089493432837 26 6519295339621917 27 30644944208215577