# A149318 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 12 4 35 5 137 6 495 7 1729 8 7098 9 27593 10 104531 11 441615 12 1789017 13 7095763 14 30558979 15 127135970 16 519443108 17 2268126113 18 9614119097 19 40107736971 20 176961174469 21 760585348983 22 3222491238945 23 14334497855854 24 62275808514893 25 267036125594002 26 1195679239707388 27 5239373610306369