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| n | a(n) |
|---|---|
| 1 | 42 |
| 2 | 1764 |
| 3 | 10710 |
| 4 | 65025 |
| 5 | 221340 |
| 6 | 753424 |
| 7 | 1913940 |
| 8 | 4862025 |
| 9 | 10332630 |
| 10 | 21958596 |
| 11 | 41363322 |
| 12 | 77915929 |
| 13 | 134523480 |
| 14 | 232257600 |
| 15 | 375406920 |
| 16 | 606784689 |
| 17 | 931373730 |
| 18 | 1429596100 |
| 19 | 2104920510 |
| 20 | 3099260241 |
| 21 | 4409811252 |
| 22 | 6274540944 |
| 23 | 8675694300 |
[42,1764,10710,65025,221340,753424,1913940, 4862025,10332630,21958596,41363322,77915929, 134523480,232257600,375406920,606784689,931373730, 1429596100,2104920510,3099260241,4409811252, 6274540944,8675694300] |