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| n | a(n) |
|---|---|
| 1 | 104 |
| 2 | 368 |
| 3 | 1408 |
| 4 | 5272 |
| 5 | 19992 |
| 6 | 75192 |
| 7 | 284256 |
| 8 | 1071200 |
| 9 | 4044648 |
| 10 | 15253448 |
| 11 | 57567440 |
| 12 | 217164120 |
| 13 | 819446824 |
| 14 | 3091567752 |
| 15 | 11664944600 |
| 16 | 44010709432 |
| 17 | 166054788688 |
| 18 | 626518324872 |
| 19 | 2363865184800 |
| 20 | 8918824197024 |
| 21 | 33650767785632 |
| 22 | 126964068474600 |
[104,368,1408,5272,19992,75192,284256,1071200, 4044648,15253448,57567440,217164120,819446824, 3091567752,11664944600,44010709432,166054788688, 626518324872,2363865184800,8918824197024, 33650767785632,126964068474600] |