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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 26 |
| 5 | 79 |
| 6 | 274 |
| 7 | 964 |
| 8 | 3496 |
| 9 | 12664 |
| 10 | 46157 |
| 11 | 168240 |
| 12 | 615173 |
| 13 | 2256669 |
| 14 | 8321911 |
| 15 | 30871862 |
| 16 | 115280183 |
| 17 | 433247309 |
| 18 | 1638036186 |
| 19 | 6225871432 |
| 20 | 23769249188 |
| 21 | 91077899373 |
| 22 | 350002189936 |
| 23 | 1348065993111 |
| 24 | 5201249282212 |
| 25 | 20094668668700 |