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 | 3 |
| 3 | 7 |
| 4 | 15 |
| 5 | 47 |
| 6 | 111 |
| 7 | 367 |
| 8 | 879 |
| 9 | 2927 |
| 10 | 19311 |
| 11 | 52079 |
| 12 | 314223 |
| 13 | 1362799 |
| 14 | 3459951 |
| 15 | 11848559 |
| 16 | 78957423 |
| 17 | 615828335 |
| 18 | 1689570159 |
| 19 | 10279504751 |
| 20 | 44639243119 |
| 21 | 113358719855 |
| 22 | 663114533743 |
| 23 | 2862137789295 |
| 24 | 20454323833711 |
| 25 | 301929300544367 |