# A027101 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 9 4 18 5 49 6 127 7 331 8 883 9 2376 10 6439 11 17591 12 48347 13 133589 14 370883 15 1033997 16 2893498 17 8124303 18 22880569 19 64616728 20 182943204 21 519146325 22 1476337528 23 4206621803 24 12008000771 25 34335363519 26 98332343337 27 282026580873