# A047134 (b-file synthesized from sequence entry)
2 1
3 3
4 9
5 28
6 76
7 235
8 768
9 1679
10 5564
11 19613
12 126070
13 437604
14 1610354
15 6015427
16 27167487
17 104861750
18 403189070
19 1550582656
20 6369655714
21 25112303442
22 98241919002
23 383342448413
24 1531690132421
25 6058160780203
26 23859853900666