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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 16 |
| 3 | 276 |
| 4 | 4917 |
| 5 | 88132 |
| 6 | 1581196 |
| 7 | 28372701 |
| 8 | 509125596 |
| 9 | 9135883240 |
| 10 | 163936760185 |
| 11 | 2941725767256 |
| 12 | 52787126964456 |
| 13 | 947226559367881 |
| 14 | 16997290941068152 |
| 15 | 305004010378316172 |
| 16 | 5473074895864584141 |
| 17 | 98210344115173624636 |
| 18 | 1762313119177232976916 |
| 19 | 31623425801074947486405 |
[0,1,16,276,4917,88132,1581196,28372701,509125596, 9135883240,163936760185,2941725767256, 52787126964456,947226559367881,16997290941068152, 305004010378316172,5473074895864584141, 98210344115173624636,1762313119177232976916, 31623425801074947486405] |