n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 34 |
4 | 336 |
5 | 4390 |
6 | 66312 |
7 | 1197858 |
8 | 24612000 |
9 | 574002448 |
10 | 14903406552 |
11 | 427622607366 |
12 | 13419501812640 |
13 | 457579466056498 |
14 | 16840326075104280 |
15 | 665473192580864556 |
16 | 28101209228393371200 |
17 | 1262896789586657015796 |
18 | 60182268296582518426368 |
19 | 3031282541337682050032664 |
[1,4,34,336,4390,66312,1197858,24612000,574002448, 14903406552,427622607366,13419501812640, 457579466056498,16840326075104280, 665473192580864556,28101209228393371200, 1262896789586657015796,60182268296582518426368, 3031282541337682050032664] |