n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 1 |
4 | 5 |
5 | 9 |
6 | 70 |
7 | 178 |
8 | 2132 |
9 | 6900 |
10 | 118536 |
11 | 462936 |
12 | 10606752 |
13 | 48446496 |
14 | 1397029824 |
15 | 7305837120 |
16 | 254261617920 |
17 | 1498370192640 |
18 | 61084867115520 |
19 | 400578023738880 |
20 | 18717879561984000 |
21 | 135203360447232000 |
22 | 7123176975979008000 |
23 | 56195977439927808000 |
[0,0,1,1,5,9,70,178,2132,6900,118536,462936, 10606752,48446496,1397029824,7305837120, 254261617920,1498370192640,61084867115520, 400578023738880,18717879561984000, 135203360447232000,7123176975979008000, 56195977439927808000] |