# A149992 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 17 4 57 5 207 6 770 7 2956 8 11511 9 45389 10 181551 11 732140 12 2975463 13 12172039 14 50107475 15 207221750 16 860713442 17 3589342898 18 15020205470 19 63043294686 20 265353326080 21 1119765415144 22 4736096978950 23 20073601677112 24 85247397615355 25 362674562863687 26 1545498849494243 27 6596146668760089