# A149420 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 12
4 56
5 191
6 919
7 3461
8 16942
9 67024
10 330985
11 1351694
12 6706020
13 28005748
14 139322499
15 591548083
16 2947755005
17 12676627994
18 63236396201
19 274723412297
20 1371393625593
21 6007561120023
22 30003252219169
23 132346186373218
24 661182403536292
25 2933681027414591
26 14659537853840122
27 65373537954378185