n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 12 |
3 | 57 |
4 | 309 |
5 | 1866 |
6 | 12351 |
7 | 88563 |
8 | 681870 |
9 | 5597643 |
10 | 48718569 |
11 | 447428856 |
12 | 4318854429 |
13 | 43666895343 |
14 | 461101962108 |
15 | 5072054649573 |
16 | 57986312752497 |
17 | 687610920335610 |
18 | 8442056059773267 |
19 | 107135148331162767 |
20 | 1403300026585387686 |
21 | 18946012544520590991 |
[1,3,12,57,309,1866,12351,88563,681870,5597643, 48718569,447428856,4318854429,43666895343, 461101962108,5072054649573,57986312752497, 687610920335610,8442056059773267, 107135148331162767,1403300026585387686, 18946012544520590991] |