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| n | a(n) |
|---|---|
| 1 | 18 |
| 2 | 100 |
| 3 | 1210 |
| 4 | 2028 |
| 5 | 6498 |
| 6 | 23548 |
| 7 | 49284 |
| 8 | 146068 |
| 9 | 201898 |
| 10 | 223260 |
| 11 | 296274 |
| 12 | 564898 |
| 13 | 1020100 |
| 14 | 1213594 |
| 15 | 2230930 |
| 16 | 2666298 |
| 17 | 3285748 |
| 18 | 4304178 |
| 19 | 5147788 |
| 20 | 5703298 |
| 21 | 5896980 |
| 22 | 7606564 |
| 23 | 9349410 |
| 24 | 11645554 |
| 25 | 19392748 |
| 26 | 25067908 |
| 27 | 31754524 |
| 28 | 41661514 |
| 29 | 42386748 |
| 30 | 51755988 |
| 31 | 54296298 |
[18,100,1210,2028,6498,23548,49284,146068,201898, 223260,296274,564898,1020100,1213594,2230930, 2666298,3285748,4304178,5147788,5703298,5896980, 7606564,9349410,11645554,19392748,25067908, 31754524,41661514,42386748,51755988,54296298] |