n | a(n) |
---|---|
1 | 4 |
2 | 19 |
3 | 134 |
4 | 878 |
5 | 5609 |
6 | 36011 |
7 | 231343 |
8 | 1483999 |
9 | 9515200 |
10 | 60996453 |
11 | 390995240 |
12 | 2506299034 |
13 | 16065358056 |
14 | 102978135046 |
15 | 660082481027 |
16 | 4231075253651 |
17 | 27120831228945 |
18 | 173842158021918 |
19 | 1114312870464367 |
20 | 7142646492038739 |
[4,19,134,878,5609,36011,231343,1483999,9515200, 60996453,390995240,2506299034,16065358056, 102978135046,660082481027,4231075253651, 27120831228945,173842158021918,1114312870464367, 7142646492038739] |