n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 7 |
5 | 23 |
6 | 82 |
7 | 300 |
8 | 1129 |
9 | 4334 |
10 | 16914 |
11 | 66899 |
12 | 267586 |
13 | 1080516 |
14 | 4398850 |
15 | 18035084 |
16 | 74402361 |
17 | 308624282 |
18 | 1286428765 |
19 | 5385578256 |
20 | 22635057148 |
21 | 95471113565 |
22 | 403983783772 |
23 | 1714494024947 |
24 | 7295949019114 |
25 | 31124885587680 |
26 | 133085594104222 |
27 | 570266646942488 |
[1,0,1,2,7,23,82,300,1129,4334,16914,66899,267586, 1080516,4398850,18035084,74402361,308624282, 1286428765,5385578256,22635057148,95471113565, 403983783772,1714494024947,7295949019114, 31124885587680,133085594104222,570266646942488] |