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| n | a(n) |
|---|---|
| 1 | 416 |
| 2 | 6872 |
| 3 | 119932 |
| 4 | 884728 |
| 5 | 5174842 |
| 6 | 21824440 |
| 7 | 76550058 |
| 8 | 231236220 |
| 9 | 620927172 |
| 10 | 1512868480 |
| 11 | 3409871172 |
| 12 | 7187658694 |
| 13 | 14321688284 |
| 14 | 27179247012 |
| 15 | 49484565130 |
| 16 | 86796151488 |
| 17 | 147351090962 |
| 18 | 242923972126 |
| 19 | 390163791394 |
| 20 | 612170875944 |
[416,6872,119932,884728,5174842,21824440,76550058, 231236220,620927172,1512868480,3409871172, 7187658694,14321688284,27179247012,49484565130, 86796151488,147351090962,242923972126, 390163791394,612170875944] |