# A149994 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 17 4 59 5 214 6 803 7 3056 8 11895 9 47004 10 187667 11 756321 12 3069385 13 12542846 14 51578053 15 213150329 16 884724627 17 3686093838 18 15410995185 19 64642971735 20 271932636847 21 1146871941694 22 4848125819247 23 20538011410752 24 87180357318349 25 370753442344240 26 1579383361624263 27 6738572455070115