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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 10 |
| 5 | 30 |
| 6 | 107 |
| 7 | 479 |
| 8 | 2249 |
| 9 | 11173 |
| 10 | 60144 |
| 11 | 351086 |
| 12 | 2171087 |
| 13 | 14138253 |
| 14 | 97097101 |
| 15 | 701820663 |
| 16 | 5303701310 |
| 17 | 41838047938 |
| 18 | 343716647215 |
| 19 | 2935346815495 |
| 20 | 25999729551523 |
| 21 | 238473713427285 |
| 22 | 2261375071834708 |
| 23 | 22141326012712122 |
| 24 | 223519686318676559 |
| 25 | 2323959300370456901 |