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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 15 |
| 3 | 6562 |
| 4 | 5011791 |
| 5 | 6200184825 |
| 6 | 11429262789510 |
| 7 | 29485293941863746 |
| 8 | 101592807373290699207 |
| 9 | 451093709664199690854238 |
| 10 | 2509724586752840748604036752 |
| 11 | 17105620782434790456521322932280 |
| 12 | 140205097075941134305471628610608762 |
| 13 | 1360788914644085139603907391284501566930 |
[1,0,15,6562,5011791,6200184825,11429262789510, 29485293941863746,101592807373290699207, 451093709664199690854238, 2509724586752840748604036752, 17105620782434790456521322932280, 140205097075941134305471628610608762, 1360788914644085139603907391284501566930] |