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| n | a(n) |
|---|---|
| 1 | 64 |
| 2 | 86 |
| 3 | 336 |
| 4 | 1090 |
| 5 | 3915 |
| 6 | 18990 |
| 7 | 76642 |
| 8 | 360898 |
| 9 | 1695748 |
| 10 | 9408402 |
| 11 | 50431855 |
| 12 | 270054791 |
| 13 | 1483688723 |
| 14 | 8638547369 |
| 15 | 49555516908 |
| 16 | 278416318505 |
| 17 | 1587868618303 |
| 18 | 9269491523649 |
| 19 | 53654294707162 |
| 20 | 306415770314870 |
| 21 | 1762671922872075 |
[64,86,336,1090,3915,18990,76642,360898,1695748, 9408402,50431855,270054791,1483688723,8638547369, 49555516908,278416318505,1587868618303, 9269491523649,53654294707162,306415770314870, 1762671922872075] |