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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 12 |
| 3 | 39 |
| 4 | 125 |
| 5 | 271 |
| 6 | 609 |
| 7 | 1076 |
| 8 | 1884 |
| 9 | 2950 |
| 10 | 4642 |
| 11 | 6541 |
| 12 | 9607 |
| 13 | 12969 |
| 14 | 17505 |
| 15 | 23034 |
| 16 | 30294 |
| 17 | 37888 |
| 18 | 48488 |
| 19 | 59404 |
| 20 | 73506 |
| 21 | 88779 |
| 22 | 108077 |
| 23 | 127412 |
| 24 | 153000 |
| 25 | 178514 |
| 26 | 210366 |
| 27 | 242961 |
| 28 | 283243 |
| 29 | 322120 |
| 30 | 373147 |
| 31 | 422454 |
| 32 | 482442 |
| 33 | 542604 |
| 34 | 615300 |
| 35 | 685885 |
| 36 | 773189 |
| 37 | 857791 |
[1,4,12,39,125,271,609,1076,1884,2950,4642,6541, 9607,12969,17505,23034,30294,37888,48488,59404, 73506,88779,108077,127412,153000,178514,210366, 242961,283243,322120,373147,422454,482442,542604, 615300,685885,773189,857791] |