# A002461 (b-file synthesized from sequence entry)
2 1
3 3
4 20
5 35
6 126
7 231
8 3432
9 6435
10 24310
11 46189
12 352716
13 676039
14 2600150
15 5014575
16 155117520
17 300540195
18 1166803110
19 2268783825
20 17672631900
21 34461632205
22 134564468610
23 263012370465
24 4116715363800
25 8061900920775
26 31602651609438
27 61989816618513
28 486734856412028