# A180414 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 8 4 16 5 36 6 80 7 194 8 506 9 1400 10 4039 11 12044 12 36406 13 111324 14 342447 15 1064835 16 3341434 17 10583931 18 33728050 19 107931849 20 346616201