# A150073 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 18 4 65 5 240 6 918 7 3609 8 14571 9 59624 10 247322 11 1038351 12 4401989 13 18803632 14 80903679 15 350281242 16 1524630402 17 6667663326 18 29286656081 19 129132109006 20 571345532548 21 2535959521772 22 11288724438289 23 50384304361736 24 225426802809994 25 1010875691689569 26 4542536427012601 27 20452372960668591