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 | 5000 |
| 2 | 4170000 |
| 3 | 1394447000 |
| 4 | 250799764000 |
| 5 | 28222682700200 |
| 6 | 2180706863326000 |
| 7 | 123252789641763000 |
| 8 | 5335428332027176000 |
| 9 | 183203070393610797000 |
| 10 | 5129723834328569406800 |
| 11 | 119780004243882975543000 |
| 12 | 2376073555319729124284000 |
| 13 | 40672867087351099089831400 |