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 | 20 |
| 3 | 130 |
| 4 | 1070 |
| 5 | 10738 |
| 6 | 127316 |
| 7 | 1741705 |
| 8 | 27003335 |
| 9 | 467906045 |
| 10 | 8961068424 |
| 11 | 187959552998 |
| 12 | 4285257122545 |
| 13 | 105513858706830 |
| 14 | 2790444044794960 |