n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 12 |
4 | 61 |
5 | 380 |
6 | 2815 |
7 | 24213 |
8 | 237348 |
9 | 2612681 |
10 | 31915787 |
11 | 428481472 |
12 | 6271362282 |
13 | 99388642292 |
14 | 1695614865711 |
15 | 30984649882928 |
16 | 603790447393402 |
17 | 12498732438500663 |
18 | 273902239550757626 |
19 | 6334968666307580051 |
20 | 154211723833861061644 |
21 | 3941258052200287007636 |
[1,1,3,12,61,380,2815,24213,237348,2612681, 31915787,428481472,6271362282,99388642292, 1695614865711,30984649882928,603790447393402, 12498732438500663,273902239550757626, 6334968666307580051,154211723833861061644, 3941258052200287007636] |