n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 9 |
3 | 40 |
4 | 89 |
5 | 396 |
6 | 881 |
7 | 3920 |
8 | 8721 |
9 | 38804 |
10 | 86329 |
11 | 384120 |
12 | 854569 |
13 | 3802396 |
14 | 8459361 |
15 | 37639840 |
16 | 83739041 |
17 | 372596004 |
18 | 828931049 |
19 | 3688320200 |
20 | 8205571449 |
21 | 36510605996 |
22 | 81226783441 |
23 | 361417739760 |
24 | 804062262961 |
25 | 3577666791604 |
26 | 7959395846169 |
27 | 35415250176280 |
[1,4,9,40,89,396,881,3920,8721,38804,86329,384120, 854569,3802396,8459361,37639840,83739041, 372596004,828931049,3688320200,8205571449, 36510605996,81226783441,361417739760,804062262961, 3577666791604,7959395846169,35415250176280] |