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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 11 |
| 4 | 36 |
| 5 | 183 |
| 6 | 1467 |
| 7 | 19074 |
| 8 | 400557 |
| 9 | 13618941 |
| 10 | 749041758 |
| 11 | 66664716465 |
| 12 | 9599719170963 |
| 13 | 2236734566834382 |
| 14 | 843248931696562017 |
| 15 | 514381848334902830373 |
| 16 | 507694884306549093578154 |
| 17 | 810788730237558902444311941 |
| 18 | 2095078078933852203916102055547 |
[1,4,11,36,183,1467,19074,400557,13618941, 749041758,66664716465,9599719170963, 2236734566834382,843248931696562017, 514381848334902830373,507694884306549093578154, 810788730237558902444311941, 2095078078933852203916102055547] |