n | a(n) |
---|---|
1 | 0 |
2 | 4 |
3 | 12 |
4 | 152 |
5 | 424 |
6 | 5180 |
7 | 14420 |
8 | 175984 |
9 | 489872 |
10 | 5978292 |
11 | 16641244 |
12 | 203085960 |
13 | 565312440 |
14 | 6898944364 |
15 | 19203981732 |
16 | 234361022432 |
17 | 652370066464 |
18 | 7961375818340 |
19 | 22161378278060 |
20 | 270452416801144 |
21 | 752834491387592 |
22 | 9187420795420572 |
23 | 25574211328900084 |
[0,4,12,152,424,5180,14420,175984,489872,5978292, 16641244,203085960,565312440,6898944364, 19203981732,234361022432,652370066464, 7961375818340,22161378278060,270452416801144, 752834491387592,9187420795420572, 25574211328900084] |