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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 14 |
| 4 | 66 |
| 5 | 186 |
| 6 | 378 |
| 7 | 546 |
| 8 | 1190 |
| 9 | 1470 |
| 10 | 2406 |
| 11 | 4470 |
| 12 | 5250 |
| 13 | 7086 |
| 14 | 18578 |
| 15 | 20166 |
| 16 | 25806 |
| 17 | 42602 |
| 18 | 58590 |
| 19 | 69006 |
| 20 | 85566 |
| 21 | 134946 |
| 22 | 137346 |
| 23 | 170586 |
| 24 | 187838 |
| 25 | 206646 |
| 26 | 262146 |
| 27 | 272610 |
| 28 | 285390 |
| 29 | 289394 |
| 30 | 420210 |
| 31 | 500570 |
| 32 | 538734 |
| 33 | 592410 |
| 34 | 595686 |
| 35 | 602250 |
| 36 | 618450 |
[2,6,14,66,186,378,546,1190,1470,2406,4470,5250, 7086,18578,20166,25806,42602,58590,69006,85566, 134946,137346,170586,187838,206646,262146,272610, 285390,289394,420210,500570,538734,592410,595686, 602250,618450] |