n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 24 |
5 | 114 |
6 | 600 |
7 | 3372 |
8 | 19824 |
9 | 120426 |
10 | 749976 |
11 | 4762644 |
12 | 30723792 |
13 | 200778612 |
14 | 1326360048 |
15 | 8842981848 |
16 | 59425117152 |
17 | 402092408346 |
18 | 2737156004376 |
19 | 18732169337604 |
20 | 128806616999184 |
21 | 889479590046108 |
22 | 6165939982059600 |
23 | 42891532191557736 |
24 | 299307319060137504 |
[1,1,2,6,24,114,600,3372,19824,120426,749976, 4762644,30723792,200778612,1326360048,8842981848, 59425117152,402092408346,2737156004376, 18732169337604,128806616999184,889479590046108, 6165939982059600,42891532191557736, 299307319060137504] |