# A148490 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 6
4 21
5 75
6 284
7 1109
8 4470
9 18453
10 77433
11 329126
12 1415834
13 6149299
14 26931302
15 118780241
16 527010199
17 2350740211
18 10534962936
19 47408681317
20 214136796301
21 970426128408
22 4410950701961
23 20104046171859
24 91856203336505
25 420644431533937
26 1930293373533896
27 8874862002582146
28 40875930281689623