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 | 19 |
| 2 | 90 |
| 3 | 3401 |
| 4 | 8010 |
| 5 | 150499 |
| 6 | 704970 |
| 7 | 52691617 |
| 8 | 61372170 |
| 9 | 1140755269 |
| 10 | 5287653450 |
| 11 | 195603709691 |
| 12 | 451204910730 |
| 13 | 8308374039439 |
| 14 | 38168889398730 |
| 15 | 5600435030805569 |
| 16 | 3204210737415690 |
| 17 | 58567326513265009 |
| 18 | 267221673587412810 |
| 19 | 9740358918723188381 |