n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 5 |
3 | 18 |
4 | 68 |
5 | 233 |
6 | 838 |
7 | 2989 |
8 | 10687 |
9 | 38097 |
10 | 136002 |
11 | 485370 |
12 | 1732377 |
13 | 6182628 |
14 | 22065919 |
15 | 78752901 |
16 | 281068809 |
17 | 1003130814 |
18 | 3580164896 |
19 | 12777572157 |
20 | 45603031014 |
21 | 162756761629 |
22 | 580877276331 |
23 | 2073145244569 |
24 | 7399034871398 |
25 | 26407082201462 |
26 | 94246615039341 |
[1,1,5,18,68,233,838,2989,10687,38097,136002, 485370,1732377,6182628,22065919,78752901, 281068809,1003130814,3580164896,12777572157, 45603031014,162756761629,580877276331, 2073145244569,7399034871398,26407082201462, 94246615039341] |