# A216247 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 2
4 15
5 77
6 354
7 2509
8 19369
9 146840
10 1321773
11 13466872
12 151177886
13 1827144180
14 23686530621
15 335038346222
16 4922031402993
17 75768551557262
18 1240672912146220
19 21264349760865217
20 384135346377854363
21 7286741020161077248
22 145190876484745421540