n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 9 |
4 | 32 |
5 | 300 |
6 | 864 |
7 | 17612 |
8 | 74752 |
9 | 1152792 |
10 | 6470400 |
11 | 220057992 |
12 | 719622144 |
13 | 40754156352 |
14 | 192835098624 |
15 | 4787867880000 |
16 | 55181218873344 |
17 | 3071730630989952 |
18 | 11004144881762304 |
19 | 1179255538492239744 |
20 | 5720352215040000000 |
21 | 253837962769406045184 |
22 | 3262870639485701849088 |
[1,1,2,9,32,300,864,17612,74752,1152792,6470400, 220057992,719622144,40754156352,192835098624, 4787867880000,55181218873344,3071730630989952, 11004144881762304,1179255538492239744, 5720352215040000000,253837962769406045184, 3262870639485701849088] |