n | a(n) |
---|---|
1 | 2 |
2 | 13 |
3 | 87 |
4 | 619 |
5 | 4808 |
6 | 39322 |
7 | 332398 |
8 | 2880950 |
9 | 25424042 |
10 | 227529235 |
11 | 2059034532 |
12 | 18803987677 |
13 | 173032827655 |
14 | 1602470967129 |
15 | 14922285687184 |
16 | 139619172246129 |
17 | 1311778581969146 |
18 | 12369977145161275 |
19 | 117028833678543917 |
20 | 1110409801410336132 |
[2,13,87,619,4808,39322,332398,2880950,25424042, 227529235,2059034532,18803987677,173032827655, 1602470967129,14922285687184,139619172246129, 1311778581969146,12369977145161275, 117028833678543917,1110409801410336132] |