n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 17 |
3 | 73 |
4 | 324 |
5 | 1469 |
6 | 6838 |
7 | 32490 |
8 | 157398 |
9 | 775010 |
10 | 3870690 |
11 | 19567202 |
12 | 99957231 |
13 | 515250057 |
14 | 2676884745 |
15 | 14002926871 |
16 | 73693381322 |
17 | 389904743248 |
18 | 2072794614996 |
19 | 11066421965311 |
20 | 59310040841395 |
21 | 318978744562253 |
22 | 1720962766007827 |
[1,4,17,73,324,1469,6838,32490,157398,775010, 3870690,19567202,99957231,515250057,2676884745, 14002926871,73693381322,389904743248, 2072794614996,11066421965311,59310040841395, 318978744562253,1720962766007827] |