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 | 13 |
| 2 | 169 |
| 3 | 499 |
| 4 | 1322 |
| 5 | 4041 |
| 6 | 12151 |
| 7 | 39050 |
| 8 | 126411 |
| 9 | 423951 |
| 10 | 1437618 |
| 11 | 4974835 |
| 12 | 17381451 |
| 13 | 61478628 |
| 14 | 219050691 |
| 15 | 786599271 |
| 16 | 2839798658 |
| 17 | 10305461639 |
| 18 | 37542605947 |
| 19 | 137251905940 |
| 20 | 503176001107 |
| 21 | 1849256209667 |
| 22 | 6809974286746 |
| 23 | 25122207285003 |