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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 64 |
| 3 | 187 |
| 4 | 568 |
| 5 | 4219 |
| 6 | 19819 |
| 7 | 85583 |
| 8 | 452386 |
| 9 | 2248258 |
| 10 | 10683960 |
| 11 | 53021058 |
| 12 | 262380806 |
| 13 | 1279454090 |
| 14 | 6288355637 |
| 15 | 30965350526 |
| 16 | 151903390611 |
| 17 | 745956024380 |
| 18 | 3666614206098 |
| 19 | 18007858418196 |
| 20 | 88444652958379 |
| 21 | 434517915090590 |
[16,64,187,568,4219,19819,85583,452386,2248258, 10683960,53021058,262380806,1279454090,6288355637, 30965350526,151903390611,745956024380, 3666614206098,18007858418196,88444652958379, 434517915090590] |