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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 16 |
| 3 | 42 |
| 4 | 87 |
| 5 | 156 |
| 6 | 254 |
| 7 | 386 |
| 8 | 557 |
| 9 | 772 |
| 10 | 1036 |
| 11 | 1354 |
| 12 | 1731 |
| 13 | 2172 |
| 14 | 2682 |
| 15 | 3266 |
| 16 | 3929 |
| 17 | 4676 |
| 18 | 5512 |
| 19 | 6442 |
| 20 | 7471 |
| 21 | 8604 |
| 22 | 9846 |
| 23 | 11202 |
| 24 | 12677 |
| 25 | 14276 |
| 26 | 16004 |
| 27 | 17866 |
| 28 | 19867 |
| 29 | 22012 |
| 30 | 24306 |
| 31 | 26754 |
| 32 | 29361 |
| 33 | 32132 |
| 34 | 35072 |
| 35 | 38186 |
| 36 | 41479 |
[1,4,16,42,87,156,254,386,557,772,1036,1354,1731, 2172,2682,3266,3929,4676,5512,6442,7471,8604,9846, 11202,12677,14276,16004,17866,19867,22012,24306, 26754,29361,32132,35072,38186,41479] |