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| n | a(n) |
|---|---|
| 1 | 42 |
| 2 | 708 |
| 3 | 4020 |
| 4 | 15120 |
| 5 | 38544 |
| 6 | 83136 |
| 7 | 169686 |
| 8 | 294678 |
| 9 | 475500 |
| 10 | 746340 |
| 11 | 1140624 |
| 12 | 1581612 |
| 13 | 2296986 |
| 14 | 3055734 |
| 15 | 3980526 |
| 16 | 5391264 |
| 17 | 7003662 |
| 18 | 8516346 |
| 19 | 11094810 |
| 20 | 13280970 |
| 21 | 16180932 |
| 22 | 19971282 |
| 23 | 24277212 |
| 24 | 28090218 |
| 25 | 33683862 |
| 26 | 39656604 |
| 27 | 45901494 |
| 28 | 53121744 |
| 29 | 62678268 |
| 30 | 69382632 |
[42,708,4020,15120,38544,83136,169686,294678, 475500,746340,1140624,1581612,2296986,3055734, 3980526,5391264,7003662,8516346,11094810,13280970, 16180932,19971282,24277212,28090218,33683862, 39656604,45901494,53121744,62678268,69382632] |