n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 19 |
4 | 100 |
5 | 570 |
6 | 3442 |
7 | 21685 |
8 | 141112 |
9 | 941990 |
10 | 6419174 |
11 | 44493000 |
12 | 312818326 |
13 | 2226155632 |
14 | 16008452202 |
15 | 116167346499 |
16 | 849724397580 |
17 | 6259403310366 |
18 | 46399703925202 |
19 | 345894094030552 |
[1,1,4,19,100,570,3442,21685,141112,941990, 6419174,44493000,312818326,2226155632,16008452202, 116167346499,849724397580,6259403310366, 46399703925202,345894094030552] |