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 | 4 |
| 2 | 6 |
| 3 | 12 |
| 4 | 23 |
| 5 | 43 |
| 6 | 105 |
| 7 | 233 |
| 8 | 479 |
| 9 | 968 |
| 10 | 2146 |
| 11 | 4683 |
| 12 | 9928 |
| 13 | 20709 |
| 14 | 44652 |
| 15 | 96244 |
| 16 | 205631 |
| 17 | 435063 |
| 18 | 930935 |
| 19 | 1994977 |
| 20 | 4266607 |
| 21 | 9080728 |
| 22 | 19396626 |
| 23 | 41471567 |
| 24 | 88657284 |
| 25 | 189124509 |
| 26 | 403873550 |
| 27 | 862832200 |
| 28 | 1843730503 |
| 29 | 3936307111 |
| 30 | 8406314159 |