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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
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| 80 | 23 |
[0,0,0,0,1,1,1,2,2,2,2,3,3,3,4,4,4,4,5,5,5,6,6,6, 6,7,7,7,8,8,8,8,9,9,9,10,10,10,10,11,11,11,12,12, 12,13,13,13,13,14,14,14,15,15,15,15,16,16,16,17, 17,17,17,18,18,18,19,19,19,19,20,20,20,21,21,21, 21,22,22,22,23] |