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| n | a(n) |
|---|---|
| 1 | 24 |
| 2 | 80 |
| 3 | 222 |
| 4 | 560 |
| 5 | 1392 |
| 6 | 3346 |
| 7 | 8024 |
| 8 | 19004 |
| 9 | 44796 |
| 10 | 105568 |
| 11 | 246694 |
| 12 | 581026 |
| 13 | 1352628 |
| 14 | 3191480 |
| 15 | 7423406 |
| 16 | 17570428 |
| 17 | 40904298 |
| 18 | 97193124 |
| 19 | 226680746 |
| 20 | 540902924 |
| 21 | 1264446486 |
| 22 | 3030265486 |
| 23 | 7101406744 |
| 24 | 17090819062 |
| 25 | 40152342862 |
| 26 | 97024689184 |
[24,80,222,560,1392,3346,8024,19004,44796,105568, 246694,581026,1352628,3191480,7423406,17570428, 40904298,97193124,226680746,540902924,1264446486, 3030265486,7101406744,17090819062,40152342862, 97024689184] |