n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 26 |
3 | 222 |
4 | 2451 |
5 | 33288 |
6 | 538084 |
7 | 10101010 |
8 | 216145205 |
9 | 5195862732 |
10 | 138679078110 |
11 | 4070332170534 |
12 | 130325562613351 |
13 | 4521260802379792 |
14 | 168962471790509960 |
15 | 6767528048726614650 |
16 | 289242639716420115369 |
[1,4,26,222,2451,33288,538084,10101010,216145205, 5195862732,138679078110,4070332170534, 130325562613351,4521260802379792, 168962471790509960,6767528048726614650, 289242639716420115369] |