# A199137 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 9 4 30 5 97 6 336 7 1153 8 4081 9 14552 10 52609 11 191657 12 704385 13 2604476 14 9687433 15 36207241 16 135920489 17 512182805 18 1936656361 19 7345211322 20 27935373368 21 106509551719 22 407015199144 23 1558603221623 24 5979839952471 25 22983021033071 26 88477003979994 27 341120527468590