# A149136 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 9 4 34 5 114 6 412 7 1525 8 5750 9 22180 10 87212 11 344932 12 1378350 13 5559474 14 22587780 15 92430941 16 380169394 17 1570761624 18 6519130912 19 27166630828 20 113611754346 21 476626237184 22 2005234655498 23 8458477866254 24 35766576196524 25 151574472175434 26 643662078045994 27 2738451648287230 28 11671117825365286