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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | 511 |
| 3 | 7762 |
| 4 | 107065 |
| 5 | 1397536 |
| 6 | 17652307 |
| 7 | 218558494 |
| 8 | 2673170269 |
| 9 | 32451457324 |
| 10 | 392152259863 |
| 11 | 4725695939146 |
| 12 | 56851786048513 |
| 13 | 683251595827192 |
| 14 | 8206387016186779 |
| 15 | 98529159613684918 |
| 16 | 1182723165477092197 |
| 17 | 14195324589704967940 |
| 18 | 170362624423844562655 |
[1,28,511,7762,107065,1397536,17652307,218558494, 2673170269,32451457324,392152259863,4725695939146, 56851786048513,683251595827192,8206387016186779, 98529159613684918,1182723165477092197, 14195324589704967940,170362624423844562655] |