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) |
|---|---|
| 1 | 21 |
| 2 | 441 |
| 3 | 5357 |
| 4 | 59812 |
| 5 | 607043 |
| 6 | 5963040 |
| 7 | 57268342 |
| 8 | 544455870 |
| 9 | 5145953202 |
| 10 | 48496979643 |
| 11 | 456336864550 |
| 12 | 4290529415423 |
| 13 | 40323106384871 |
| 14 | 378881102825949 |
| 15 | 3559611742043731 |
| 16 | 33440802573235066 |
| 17 | 314150208927203377 |