This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 7 |
| 5 | 416 |
| 6 | 24244 |
| 7 | 1951352 |
| 8 | 265517333 |
| 9 | 68652859502 |
| 10 | 35182667175398 |
| 11 | 36028748718835272 |
| 12 | 73786974794973865449 |
| 13 | 302231454853009287213496 |
| 14 | 2475880078568912926825399800 |
| 15 | 40564819207303268441662426947840 |
| 16 | 1329227995784915869870199216532048487 |