n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 16 |
4 | 76 |
5 | 399 |
6 | 2206 |
7 | 12664 |
8 | 74790 |
9 | 451420 |
10 | 2772313 |
11 | 17267652 |
12 | 108821293 |
13 | 692609446 |
14 | 4445642625 |
15 | 28744599748 |
16 | 187047449289 |
17 | 1224027357216 |
18 | 8050074481917 |
19 | 53179900898596 |
20 | 352726704965748 |
21 | 2348036826102013 |
22 | 15682048658695168 |
23 | 105052549830928908 |
24 | 705678173069959645 |
[1,1,4,16,76,399,2206,12664,74790,451420,2772313, 17267652,108821293,692609446,4445642625, 28744599748,187047449289,1224027357216, 8050074481917,53179900898596,352726704965748, 2348036826102013,15682048658695168, 105052549830928908,705678173069959645] |