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) |
|---|---|
| 4 | 1 |
| 5 | 10 |
| 6 | 231 |
| 7 | 2300 |
| 8 | 14820 |
| 9 | 72905 |
| 10 | 298925 |
| 11 | 1077748 |
| 12 | 3540913 |
| 13 | 10871723 |
| 14 | 31775031 |
| 15 | 89633545 |
| 16 | 246575109 |
| 17 | 666605513 |
| 18 | 1781049298 |
| 19 | 4721874921 |
| 20 | 12456394685 |
| 21 | 32758238316 |
| 22 | 85985810716 |
| 23 | 225446971141 |
| 24 | 590714939822 |
| 25 | 1547211717890 |
| 26 | 4051642877482 |
| 27 | 10608719012366 |
| 28 | 27775885869046 |