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 | 4 |
| 2 | 13 |
| 3 | 41 |
| 4 | 125 |
| 5 | 367 |
| 6 | 1111 |
| 7 | 3395 |
| 8 | 10491 |
| 9 | 32670 |
| 10 | 102231 |
| 11 | 320990 |
| 12 | 1010196 |
| 13 | 3184138 |
| 14 | 10046921 |
| 15 | 31723592 |
| 16 | 100216745 |
| 17 | 316694005 |
| 18 | 1001003332 |
| 19 | 3164437425 |
| 20 | 10004650118 |
| 21 | 31632790244 |
| 22 | 100021566157 |
| 23 | 316274216762 |
| 24 | 1000100055684 |