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 | 1 |
| 1 | 5 |
| 2 | 49 |
| 3 | 605 |
| 4 | 8065 |
| 5 | 113525 |
| 6 | 1656145 |
| 7 | 24774125 |
| 8 | 377601025 |
| 9 | 5839329125 |
| 10 | 91349718769 |
| 11 | 1442580779645 |
| 12 | 22959923825281 |
| 13 | 367847984671445 |
| 14 | 5926784048373265 |
| 15 | 95960317086368525 |
| 16 | 1560335109283897345 |
| 17 | 25466972987548413125 |
| 18 | 417048643127042376625 |
| 19 | 6850021673230814868125 |