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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 14 |
| 3 | 45 |
| 4 | 373 |
| 5 | 1202 |
| 6 | 18981 |
| 7 | 82020 |
| 8 | 1506810 |
| 9 | 6857704 |
| 10 | 129852811 |
| 11 | 597088326 |
| 12 | 11405469595 |
| 13 | 52673539459 |
| 14 | 1011491590878 |
| 15 | 4687412959525 |
| 16 | 90358383040770 |
| 17 | 419948850379586 |
| 18 | 8119819516703235 |
| 19 | 37831903319054460 |
| 20 | 733292643562816976 |
[5,14,45,373,1202,18981,82020,1506810,6857704, 129852811,597088326,11405469595,52673539459, 1011491590878,4687412959525,90358383040770, 419948850379586,8119819516703235, 37831903319054460,733292643562816976] |