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 | 5 |
| 2 | 29 |
| 3 | 193 |
| 4 | 1457 |
| 5 | 12341 |
| 6 | 116125 |
| 7 | 1203329 |
| 8 | 13627073 |
| 9 | 167525317 |
| 10 | 2222710781 |
| 11 | 31665408545 |
| 12 | 482196718129 |
| 13 | 7817359305653 |
| 14 | 134443910166077 |
| 15 | 2444991262876321 |
| 16 | 46883166605035265 |
| 17 | 945426638499719429 |
| 18 | 20002372214708227933 |
| 19 | 443036881445294292737 |
| 20 | 10252840082607606694961 |