n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 9 |
3 | 73 |
4 | 545 |
5 | 3881 |
6 | 27761 |
7 | 208593 |
8 | 1655241 |
9 | 13490897 |
10 | 110135641 |
11 | 895031361 |
12 | 7279880713 |
13 | 59647817713 |
14 | 493774294393 |
15 | 4125976137817 |
16 | 34688652854097 |
17 | 292496479087385 |
18 | 2469649871976929 |
19 | 20883345481893257 |
20 | 177031405058676369 |
21 | 1505681846157691769 |
[1,1,9,73,545,3881,27761,208593,1655241,13490897, 110135641,895031361,7279880713,59647817713, 493774294393,4125976137817,34688652854097, 292496479087385,2469649871976929, 20883345481893257,177031405058676369, 1505681846157691769] |