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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 42 |
| 3 | 228 |
| 4 | 776 |
| 5 | 2046 |
| 6 | 4578 |
| 7 | 9128 |
| 8 | 16704 |
| 9 | 28602 |
| 10 | 46442 |
| 11 | 72204 |
| 12 | 108264 |
| 13 | 157430 |
| 14 | 222978 |
| 15 | 308688 |
| 16 | 418880 |
| 17 | 558450 |
| 18 | 732906 |
| 19 | 948404 |
| 20 | 1211784 |
| 21 | 1530606 |
| 22 | 1913186 |
| 23 | 2368632 |
| 24 | 2906880 |
| 25 | 3538730 |
| 26 | 4275882 |
| 27 | 5130972 |
| 28 | 6117608 |
| 29 | 7250406 |
| 30 | 8545026 |
[2,42,228,776,2046,4578,9128,16704,28602,46442, 72204,108264,157430,222978,308688,418880,558450, 732906,948404,1211784,1530606,1913186,2368632, 2906880,3538730,4275882,5130972,6117608,7250406, 8545026] |