n | a(n) |
---|---|
0 | 1 |
1 | 20 |
2 | 128 |
3 | 656 |
4 | 3928 |
5 | 23840 |
6 | 148304 |
7 | 934968 |
8 | 5958552 |
9 | 38285216 |
10 | 247607348 |
11 | 1609914524 |
12 | 10513615792 |
13 | 68913452056 |
14 | 453123210178 |
15 | 2987405569166 |
16 | 19741419610536 |
17 | 130718419293680 |
18 | 867078544410362 |
19 | 5760352822741182 |
[1,20,128,656,3928,23840,148304,934968,5958552, 38285216,247607348,1609914524,10513615792, 68913452056,453123210178,2987405569166, 19741419610536,130718419293680,867078544410362, 5760352822741182] |