n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 7 |
4 | 20 |
5 | 54 |
6 | 164 |
7 | 500 |
8 | 1630 |
9 | 5471 |
10 | 19246 |
11 | 70020 |
12 | 264961 |
13 | 1035540 |
14 | 4187725 |
15 | 17440159 |
16 | 74817905 |
17 | 329400093 |
18 | 1487844185 |
19 | 6873585346 |
20 | 32460719143 |
21 | 156315314070 |
22 | 767106102127 |
23 | 3828629444020 |
24 | 19423438144438 |
25 | 99998608025751 |
26 | 522200287437179 |
27 | 2762351298913471 |
[1,1,3,7,20,54,164,500,1630,5471,19246,70020, 264961,1035540,4187725,17440159,74817905, 329400093,1487844185,6873585346,32460719143, 156315314070,767106102127,3828629444020, 19423438144438,99998608025751,522200287437179, 2762351298913471] |