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| n | a(n) |
|---|---|
| 1 | 400 |
| 2 | 2444 |
| 3 | 15128 |
| 4 | 93472 |
| 5 | 577660 |
| 6 | 3570086 |
| 7 | 22063924 |
| 8 | 136360286 |
| 9 | 842739040 |
| 10 | 5208328180 |
| 11 | 32188710564 |
| 12 | 198933910242 |
| 13 | 1229459024390 |
| 14 | 7598350081290 |
| 15 | 46959616234372 |
| 16 | 290221631449614 |
| 17 | 1793638920327662 |
| 18 | 11085116434803236 |
[400,2444,15128,93472,577660,3570086,22063924, 136360286,842739040,5208328180,32188710564, 198933910242,1229459024390,7598350081290, 46959616234372,290221631449614,1793638920327662, 11085116434803236] |