n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 11 |
4 | 29 |
5 | 76 |
6 | 207 |
7 | 592 |
8 | 1780 |
9 | 5617 |
10 | 18365 |
11 | 61465 |
12 | 209173 |
13 | 720636 |
14 | 2505401 |
15 | 8773807 |
16 | 30919540 |
17 | 109581804 |
18 | 390360666 |
19 | 1397013258 |
20 | 5020578459 |
21 | 18111752521 |
22 | 65564995435 |
23 | 238097178090 |
24 | 867136619465 |
25 | 3166405246169 |
26 | 11590402816879 |
27 | 42520849230446 |
[1,4,11,29,76,207,592,1780,5617,18365,61465, 209173,720636,2505401,8773807,30919540,109581804, 390360666,1397013258,5020578459,18111752521, 65564995435,238097178090,867136619465, 3166405246169,11590402816879,42520849230446] |