# A268213 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 16 4 51 5 180 6 622 7 2288 8 8227 9 30940 10 113882 11 434112 12 1622414 13 6240360 14 23572668 15 91245600 16 347398435 17 1351035180 18 5174839714 19 20197293600 20 77729205658 21 304232711640 22 1175332659332 23 4610721207456 24 17868732968846 25 70228114687640 26 272886854006852