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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 16 |
| 3 | 38 |
| 4 | 100 |
| 5 | 275 |
| 6 | 784 |
| 7 | 2280 |
| 8 | 6724 |
| 9 | 19964 |
| 10 | 59536 |
| 11 | 177989 |
| 12 | 532900 |
| 13 | 1596849 |
| 14 | 4787344 |
| 15 | 14356482 |
| 16 | 43059844 |
| 17 | 129162891 |
| 18 | 387459856 |
| 19 | 1162329651 |
| 20 | 3486902500 |
| 21 | 10460557755 |
| 22 | 31381413904 |
| 23 | 94143792483 |
| 24 | 282430599364 |
| 25 | 847290450408 |
| 26 | 2541869016976 |
| 27 | 7625603007884 |
| 28 | 22876802020900 |
| 29 | 68630393933574 |
[7,16,38,100,275,784,2280,6724,19964,59536,177989, 532900,1596849,4787344,14356482,43059844, 129162891,387459856,1162329651,3486902500, 10460557755,31381413904,94143792483,282430599364, 847290450408,2541869016976,7625603007884, 22876802020900,68630393933574] |