# A001408 (b-file synthesized from sequence entry)
0 1
1 11
2 188
3 2992
4 51708
5 930436
6 17127356
7 320726028
8 6086177116
9 116714440696
10 2257460877244
11 43974184178012
12 861732730297212
13 16973299816150504
14 335797855252698940
15 6669051330542560708
16 132899989069230881308
17 2656406833061149357920
18 53239449964640093020476