# A218090 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 1
4 2
5 3
6 8
7 17
8 63
9 224
10 1248
11 8218
12 75992
13 906635
14 14447433
15 303100595
16 8415834690
17 309390830222
18 15105805368214
19 982300491033887