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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 26 |
| 3 | 95 |
| 4 | 375 |
| 5 | 1526 |
| 6 | 6198 |
| 7 | 25034 |
| 8 | 101312 |
| 9 | 410252 |
| 10 | 1660983 |
| 11 | 6724306 |
| 12 | 27224178 |
| 13 | 110221701 |
| 14 | 446249130 |
| 15 | 1806706543 |
| 16 | 7314734637 |
| 17 | 29614856373 |
| 18 | 119900405862 |
| 19 | 485435683612 |
| 20 | 1965362943182 |
| 21 | 7957081971789 |
| 22 | 32215501878934 |
| 23 | 130429542917213 |
[4,26,95,375,1526,6198,25034,101312,410252, 1660983,6724306,27224178,110221701,446249130, 1806706543,7314734637,29614856373,119900405862, 485435683612,1965362943182,7957081971789, 32215501878934,130429542917213] |