# A049948 (b-file synthesized from sequence entry) 1 1 2 2 3 1 4 5 5 10 6 20 7 40 8 89 9 208 10 377 11 754 12 1517 13 3064 14 6296 15 13138 16 28586 17 67246 18 121355 19 242710 20 485429 21 970888 22 1941944 23 3884434 24 7771178 25 15552430 26 31158968 27 62493400 28 125714978 29 254343502 30 520355000 31 1087650970 32 2367152042