n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 151 |
3 | 4561 |
4 | 49981 |
5 | 315121 |
6 | 1406371 |
7 | 4956001 |
8 | 14709241 |
9 | 38316961 |
10 | 90090991 |
11 | 195019441 |
12 | 394379701 |
13 | 753327121 |
14 | 1370877691 |
15 | 2392743361 |
16 | 4027518961 |
17 | 6566760001 |
18 | 10409530951 |
19 | 16092043921 |
20 | 24323047981 |
21 | 36025669681 |
22 | 52386445651 |
[1,1,151,4561,49981,315121,1406371,4956001, 14709241,38316961,90090991,195019441,394379701, 753327121,1370877691,2392743361,4027518961, 6566760001,10409530951,16092043921,24323047981, 36025669681,52386445651] |