n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 23 |
4 | 117 |
5 | 454 |
6 | 2003 |
7 | 9157 |
8 | 40899 |
9 | 179399 |
10 | 796558 |
11 | 3546996 |
12 | 15747348 |
13 | 69834517 |
14 | 310058192 |
15 | 1376868145 |
16 | 6112247118 |
17 | 27132236455 |
18 | 120453362938 |
19 | 534754586459 |
20 | 2373975139658 |
21 | 10538953415410 |
22 | 46786795734201 |
23 | 207705902269424 |
24 | 922089495910044 |
25 | 4093525019450760 |
[1,1,4,23,117,454,2003,9157,40899,179399,796558, 3546996,15747348,69834517,310058192,1376868145, 6112247118,27132236455,120453362938,534754586459, 2373975139658,10538953415410,46786795734201, 207705902269424,922089495910044,4093525019450760] |