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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 37 |
| 3 | 317 |
| 4 | 2821 |
| 5 | 25325 |
| 6 | 227797 |
| 7 | 2049917 |
| 8 | 18448741 |
| 9 | 166037645 |
| 10 | 1494336757 |
| 11 | 13449026717 |
| 12 | 121041232261 |
| 13 | 1089371073965 |
| 14 | 9804339632917 |
| 15 | 88239056630717 |
| 16 | 794151509545381 |
| 17 | 7147363585646285 |
| 18 | 64326272270292277 |
| 19 | 578936450431581917 |
[1,5,37,317,2821,25325,227797,2049917,18448741, 166037645,1494336757,13449026717,121041232261, 1089371073965,9804339632917,88239056630717, 794151509545381,7147363585646285, 64326272270292277,578936450431581917] |