n | a(n) |
---|---|
0 | 1 |
1 | 9 |
2 | 21 |
3 | 127 |
4 | 637 |
5 | 4007 |
6 | 24821 |
7 | 164659 |
8 | 1106197 |
9 | 7642295 |
10 | 53521277 |
11 | 380565539 |
12 | 2735155565 |
13 | 19854481655 |
14 | 145295269157 |
15 | 1070969265539 |
16 | 7943300521541 |
17 | 59241248227575 |
18 | 443987081678157 |
19 | 3342101935397795 |
20 | 25256877059336861 |
[1,9,21,127,637,4007,24821,164659,1106197,7642295, 53521277,380565539,2735155565,19854481655, 145295269157,1070969265539,7943300521541, 59241248227575,443987081678157,3342101935397795, 25256877059336861] |