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| n | a(n) |
|---|---|
| 0 | -1 |
| 1 | -4 |
| 2 | 1 |
| 3 | 122 |
| 4 | 683 |
| 5 | 2344 |
| 6 | 6221 |
| 7 | 14006 |
| 8 | 28087 |
| 9 | 51668 |
| 10 | 88889 |
| 11 | 144946 |
| 12 | 226211 |
| 13 | 340352 |
| 14 | 496453 |
| 15 | 705134 |
| 16 | 978671 |
| 17 | 1331116 |
| 18 | 1778417 |
| 19 | 2338538 |
| 20 | 3031579 |
| 21 | 3879896 |
| 22 | 4908221 |
| 23 | 6143782 |
| 24 | 7616423 |
| 25 | 9358724 |
| 26 | 11406121 |
| 27 | 13797026 |
| 28 | 16572947 |
| 29 | 19778608 |
| 30 | 23462069 |
| 31 | 27674846 |
| 32 | 32472031 |
| 33 | 37912412 |
| 34 | 44058593 |
[-1,-4,1,122,683,2344,6221,14006,28087,51668, 88889,144946,226211,340352,496453,705134,978671, 1331116,1778417,2338538,3031579,3879896,4908221, 6143782,7616423,9358724,11406121,13797026, 16572947,19778608,23462069,27674846,32472031, 37912412,44058593] |