# A150670 (b-file synthesized from sequence entry) 0 1 1 2 2 8 3 25 4 104 5 391 6 1666 7 6881 8 29855 9 129545 10 573055 11 2554446 12 11501808 13 52133192 14 238084704 15 1092443168 16 5042516850 17 23364889005 18 108739377523 19 507833697775 20 2379393048538 21 11182563270522 22 52693128537804 23 248926453294921 24 1178623958720194 25 5592254793534124 26 26586558799123717 27 126622271913520750