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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 21 |
| 3 | 74 |
| 4 | 207 |
| 5 | 476 |
| 6 | 985 |
| 7 | 1842 |
| 8 | 3226 |
| 9 | 5325 |
| 10 | 8414 |
| 11 | 12766 |
| 12 | 18789 |
| 13 | 26860 |
| 14 | 37525 |
| 15 | 51301 |
| 16 | 68893 |
| 17 | 90956 |
| 18 | 118400 |
| 19 | 152035 |
| 20 | 192973 |
| 21 | 242223 |
| 22 | 301121 |
| 23 | 370866 |
| 24 | 453070 |
| 25 | 549139 |
| 26 | 660950 |
| 27 | 790169 |
| 28 | 938961 |
| 29 | 1109233 |
| 30 | 1303498 |
| 31 | 1523921 |
| 32 | 1773345 |
| 33 | 2054255 |
| 34 | 2369845 |
[4,21,74,207,476,985,1842,3226,5325,8414,12766, 18789,26860,37525,51301,68893,90956,118400,152035, 192973,242223,301121,370866,453070,549139,660950, 790169,938961,1109233,1303498,1523921,1773345, 2054255,2369845] |