# A207493 (b-file synthesized from sequence entry)
1 1
2 2
3 13
4 141
5 2141
6 41798
7 997340
8 28124253
9 915095222
10 33744966795
11 1390772973547
12 63353273661835
13 3160751396077900
14 171405094563763674
15 10038777321831260503
16 631498191927510881178
17 42464602911622645539047
18 3039724643022777390236243