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 | 1 |
| 2 | 13 |
| 3 | 461 |
| 4 | 29093 |
| 5 | 2829325 |
| 6 | 392743957 |
| 7 | 73943424413 |
| 8 | 18176728317413 |
| 9 | 5661698774848621 |
| 10 | 2181096921557783605 |
| 11 | 1018705098450570562877 |
| 12 | 567347013156626397484421 |
| 13 | 371514945708955154128328461 |
| 14 | 282629242654284555347577144277 |
| 15 | 247210800978211588125067686948317 |