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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 28 |
| 3 | 296 |
| 4 | 4168 |
| 5 | 73376 |
| 6 | 1550048 |
| 7 | 38202048 |
| 8 | 1076017344 |
| 9 | 34096092672 |
| 10 | 1200459182592 |
| 11 | 46492497859584 |
| 12 | 1964295942558720 |
| 13 | 89906908894150656 |
| 14 | 4431634108980264960 |
| 15 | 234044235939806232576 |
| 16 | 13184410813249253031936 |
| 17 | 789137065405617987354624 |
[1,4,28,296,4168,73376,1550048,38202048, 1076017344,34096092672,1200459182592, 46492497859584,1964295942558720,89906908894150656, 4431634108980264960,234044235939806232576, 13184410813249253031936,789137065405617987354624] |