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 | 31 |
| 2 | 121 |
| 3 | 781 |
| 4 | 2801 |
| 5 | 16105 |
| 6 | 30941 |
| 7 | 88741 |
| 8 | 137561 |
| 9 | 292561 |
| 10 | 732541 |
| 11 | 954305 |
| 12 | 1926221 |
| 13 | 2896405 |
| 14 | 3500201 |
| 15 | 4985761 |
| 16 | 8042221 |
| 17 | 12326281 |
| 18 | 14076605 |
| 19 | 20456441 |
| 20 | 25774705 |
| 21 | 28792661 |
| 22 | 39449441 |
| 23 | 48037081 |
| 24 | 63455221 |
| 25 | 89451461 |
| 26 | 105101005 |
| 27 | 113654321 |