n | a(n) |
---|---|
1 | 1 |
2 | 6 |
3 | 36 |
4 | 274 |
5 | 2408 |
6 | 24440 |
7 | 279172 |
8 | 3542798 |
9 | 49354816 |
10 | 747851112 |
11 | 12231881948 |
12 | 214593346534 |
13 | 4016624367288 |
14 | 79843503990710 |
15 | 1678916979373760 |
16 | 37215518578700028 |
17 | 866953456654946948 |
18 | 21167221410812128266 |
19 | 540346299720320080828 |
20 | 14390314687100383124540 |
21 | 399023209689817997883900 |
[1,6,36,274,2408,24440,279172,3542798,49354816, 747851112,12231881948,214593346534,4016624367288, 79843503990710,1678916979373760,37215518578700028, 866953456654946948,21167221410812128266, 540346299720320080828,14390314687100383124540, 399023209689817997883900] |