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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 142 |
| 3 | 3188 |
| 4 | 79306 |
| 5 | 2091128 |
| 6 | 57251944 |
| 7 | 1609275536 |
| 8 | 46123258714 |
| 9 | 1341870616928 |
| 10 | 39505611952852 |
| 11 | 1174352843125976 |
| 12 | 35189447673190864 |
| 13 | 1061579548438995776 |
| 14 | 32210037668484980992 |
| 15 | 982173609216589910528 |
| 16 | 30079350892561552670554 |
| 17 | 924711257106480733093616 |
| 18 | 28524228913983070512002044 |
[1,8,142,3188,79306,2091128,57251944,1609275536, 46123258714,1341870616928,39505611952852, 1174352843125976,35189447673190864, 1061579548438995776,32210037668484980992, 982173609216589910528,30079350892561552670554, 924711257106480733093616, 28524228913983070512002044] |