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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 18 |
| 3 | 52 |
| 4 | 148 |
| 5 | 441 |
| 6 | 1372 |
| 7 | 4326 |
| 8 | 13641 |
| 9 | 42741 |
| 10 | 133208 |
| 11 | 414303 |
| 12 | 1289070 |
| 13 | 4015530 |
| 14 | 12519594 |
| 15 | 39044533 |
| 16 | 121754095 |
| 17 | 379591807 |
| 18 | 1183290025 |
| 19 | 3688511653 |
| 20 | 11498007929 |
| 21 | 35843459506 |
| 22 | 111739411177 |
| 23 | 348340800464 |
| 24 | 1085925223300 |
| 25 | 3385266114712 |
[4,18,52,148,441,1372,4326,13641,42741,133208, 414303,1289070,4015530,12519594,39044533, 121754095,379591807,1183290025,3688511653, 11498007929,35843459506,111739411177,348340800464, 1085925223300,3385266114712] |