n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 1 |
6 | 1 |
7 | 2 |
8 | 4 |
9 | 7 |
10 | 24 |
11 | 80 |
12 | 216 |
13 | 648 |
14 | 1304 |
15 | 3392 |
16 | 13808 |
17 | 59448 |
18 | 155464 |
19 | 480728 |
20 | 1588162 |
21 | 5626309 |
22 | 28279112 |
23 | 157469880 |
24 | 842498189 |
25 | 4998554801 |
26 | 28466978744 |
27 | 166572523589 |
28 | 1020487969891 |
29 | 5753385660978 |
[1,1,1,1,1,1,2,4,7,24,80,216,648,1304,3392,13808, 59448,155464,480728,1588162,5626309,28279112, 157469880,842498189,4998554801,28466978744, 166572523589,1020487969891,5753385660978] |