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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 18 |
| 3 | 31 |
| 4 | 73 |
| 5 | 105 |
| 6 | 204 |
| 7 | 249 |
| 8 | 412 |
| 9 | 501 |
| 10 | 760 |
| 11 | 865 |
| 12 | 1207 |
| 13 | 1376 |
| 14 | 1864 |
| 15 | 2070 |
| 16 | 2688 |
| 17 | 2951 |
| 18 | 3740 |
| 19 | 4068 |
| 20 | 5059 |
| 21 | 5413 |
| 22 | 6612 |
| 23 | 7057 |
| 24 | 8421 |
| 25 | 8974 |
| 26 | 10620 |
| 27 | 11247 |
| 28 | 13114 |
| 29 | 13835 |
| 30 | 16034 |
| 31 | 16812 |
| 32 | 19267 |
| 33 | 20221 |
| 34 | 22994 |
| 35 | 23973 |
| 36 | 27092 |
| 37 | 28240 |
[1,4,18,31,73,105,204,249,412,501,760,865,1207, 1376,1864,2070,2688,2951,3740,4068,5059,5413,6612, 7057,8421,8974,10620,11247,13114,13835,16034, 16812,19267,20221,22994,23973,27092,28240] |