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 | 9 |
| 3 | 25 |
| 4 | 49 |
| 5 | 145 |
| 6 | 443 |
| 7 | 1141 |
| 8 | 3009 |
| 9 | 8455 |
| 10 | 23151 |
| 11 | 62211 |
| 12 | 169651 |
| 13 | 464469 |
| 14 | 1262947 |
| 15 | 3434407 |
| 16 | 9364725 |
| 17 | 25517397 |
| 18 | 69467533 |
| 19 | 189209921 |
| 20 | 515479315 |
| 21 | 1403998341 |
| 22 | 3823905513 |
| 23 | 10415880295 |
| 24 | 28371283095 |
| 25 | 77275911315 |
| 26 | 210482481315 |