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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 49 |
| 3 | 242 |
| 4 | 930 |
| 5 | 2985 |
| 6 | 8375 |
| 7 | 21183 |
| 8 | 49365 |
| 9 | 107697 |
| 10 | 222603 |
| 11 | 439909 |
| 12 | 837071 |
| 13 | 1542126 |
| 14 | 2762572 |
| 15 | 4828665 |
| 16 | 8257309 |
| 17 | 13844903 |
| 18 | 22800305 |
| 19 | 36932600 |
| 20 | 58912756 |
| 21 | 92633675 |
| 22 | 143699769 |
| 23 | 220085207 |
| 24 | 333009601 |
| 25 | 498091361 |
| 26 | 736852507 |
| 27 | 1078664659 |
| 28 | 1563244537 |
[7,49,242,930,2985,8375,21183,49365,107697,222603, 439909,837071,1542126,2762572,4828665,8257309, 13844903,22800305,36932600,58912756,92633675, 143699769,220085207,333009601,498091361,736852507, 1078664659,1563244537] |