# A018112 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 11 4 23 5 50 6 110 7 242 8 529 9 1158 10 2537 11 5556 12 12167 13 26645 14 58351 15 127785 16 279841 17 612835 18 1342070 19 2939052 20 6436343 21 14095197 22 30867617 23 67598188 24 148035889 25 324189523 26 709955183 27 1554758333