n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 13 |
4 | 47 |
5 | 168 |
6 | 635 |
7 | 2420 |
8 | 9460 |
9 | 37445 |
10 | 150309 |
11 | 609568 |
12 | 2495710 |
13 | 10298332 |
14 | 42793974 |
15 | 178910161 |
16 | 752034697 |
17 | 3176346092 |
18 | 13473881397 |
19 | 57378127986 |
20 | 245205968960 |
21 | 1051257068207 |
22 | 4520229295852 |
23 | 19488595397346 |
24 | 84231899582543 |
25 | 364893870958302 |
[1,1,4,13,47,168,635,2420,9460,37445,150309, 609568,2495710,10298332,42793974,178910161, 752034697,3176346092,13473881397,57378127986, 245205968960,1051257068207,4520229295852, 19488595397346,84231899582543,364893870958302] |