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| n | a(n) |
|---|---|
| 1 | 18 |
| 2 | 115 |
| 3 | 431 |
| 4 | 1191 |
| 5 | 2695 |
| 6 | 5340 |
| 7 | 9615 |
| 8 | 16098 |
| 9 | 25474 |
| 10 | 38538 |
| 11 | 56176 |
| 12 | 79403 |
| 13 | 109350 |
| 14 | 147253 |
| 15 | 194487 |
| 16 | 252561 |
| 17 | 323091 |
| 18 | 407854 |
| 19 | 508767 |
| 20 | 627868 |
| 21 | 767366 |
| 22 | 929628 |
| 23 | 1117144 |
| 24 | 1332597 |
| 25 | 1578834 |
| 26 | 1858839 |
| 27 | 2175799 |
| 28 | 2533083 |
| 29 | 2934199 |
| 30 | 3382880 |
| 31 | 3883047 |
| 32 | 4438774 |
[18,115,431,1191,2695,5340,9615,16098,25474,38538, 56176,79403,109350,147253,194487,252561,323091, 407854,508767,627868,767366,929628,1117144, 1332597,1578834,1858839,2175799,2533083,2934199, 3382880,3883047,4438774] |