n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 19 |
4 | 91 |
5 | 436 |
6 | 2089 |
7 | 10009 |
8 | 47956 |
9 | 229771 |
10 | 1100899 |
11 | 5274724 |
12 | 25272721 |
13 | 121088881 |
14 | 580171684 |
15 | 2779769539 |
16 | 13318676011 |
17 | 63813610516 |
18 | 305749376569 |
19 | 1464933272329 |
20 | 7018916985076 |
21 | 33629651653051 |
22 | 161129341280179 |
[1,4,19,91,436,2089,10009,47956,229771,1100899, 5274724,25272721,121088881,580171684,2779769539, 13318676011,63813610516,305749376569, 1464933272329,7018916985076,33629651653051, 161129341280179] |