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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 16 |
| 2 | 98 |
| 3 | 664 |
| 4 | 4802 |
| 5 | 36136 |
| 6 | 278498 |
| 7 | 2177464 |
| 8 | 17174402 |
| 9 | 136190536 |
| 10 | 1083566498 |
| 11 | 8638939864 |
| 12 | 68964148802 |
| 13 | 550978111336 |
| 14 | 4404154809698 |
| 15 | 35214904015864 |
| 16 | 281627607648002 |
| 17 | 2252562882278536 |
| 18 | 18018213594168098 |
| 19 | 144134262724445464 |
[3,16,98,664,4802,36136,278498,2177464,17174402, 136190536,1083566498,8638939864,68964148802, 550978111336,4404154809698,35214904015864, 281627607648002,2252562882278536, 18018213594168098,144134262724445464] |