# A155084 (b-file synthesized from sequence entry) 0 1 1 2 2 8 3 32 4 132 5 552 6 2328 7 9872 8 42020 9 179336 10 766888 11 3284272 12 14081224 13 60426576 14 259490736 15 1114965792 16 4792924356 17 20611174920 18 88662405768 19 381494338032 20 1641837542232 21 7067257125744 22 30425523536592