n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 45 |
6 | 265 |
7 | 1855 |
8 | 14833 |
9 | 133497 |
10 | 1334961 |
11 | 14684571 |
12 | 176214841 |
13 | 2290792933 |
14 | 32071101049 |
15 | 481066515735 |
16 | 7697064251745 |
17 | 130850092279665 |
18 | 2355301661033953 |
19 | 44750731559645107 |
20 | 895014631192902121 |
21 | 18795307255050944541 |
22 | 413496759611120779881 |
[1,1,1,3,9,45,265,1855,14833,133497,1334961, 14684571,176214841,2290792933,32071101049, 481066515735,7697064251745,130850092279665, 2355301661033953,44750731559645107, 895014631192902121,18795307255050944541, 413496759611120779881] |