n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 3 |
4 | 12 |
5 | 40 |
6 | 145 |
7 | 560 |
8 | 2240 |
9 | 9156 |
10 | 38724 |
11 | 166320 |
12 | 728508 |
13 | 3239808 |
14 | 14595438 |
15 | 66543477 |
16 | 306511920 |
17 | 1424916064 |
18 | 6679435048 |
19 | 31544500416 |
20 | 149986398848 |
21 | 717562911000 |
22 | 3452381033556 |
23 | 16696661334496 |
24 | 81136327037620 |
25 | 396022179418240 |
26 | 1940898351416600 |
27 | 9548613568549380 |
28 | 47143311987432240 |
[1,0,2,3,12,40,145,560,2240,9156,38724,166320, 728508,3239808,14595438,66543477,306511920, 1424916064,6679435048,31544500416,149986398848, 717562911000,3452381033556,16696661334496, 81136327037620,396022179418240,1940898351416600, 9548613568549380,47143311987432240] |