n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 7 |
5 | 26 |
6 | 88 |
7 | 389 |
8 | 1617 |
9 | 7808 |
10 | 34783 |
11 | 184426 |
12 | 878705 |
13 | 4960662 |
14 | 25295649 |
15 | 152048803 |
16 | 820978097 |
17 | 5254469132 |
18 | 30147771222 |
19 | 204763245407 |
20 | 1249116889562 |
21 | 9012614482274 |
22 | 58336358284152 |
23 | 446435253834922 |
24 | 3064458931156669 |
25 | 24788742473819564 |
26 | 179927874744752672 |
[1,1,1,2,7,26,88,389,1617,7808,34783,184426, 878705,4960662,25295649,152048803,820978097, 5254469132,30147771222,204763245407,1249116889562, 9012614482274,58336358284152,446435253834922, 3064458931156669,24788742473819564, 179927874744752672] |