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 | 7 |
| 1 | 1 |
| 2 | 35 |
| 3 | 121 |
| 4 | 743 |
| 5 | 3561 |
| 6 | 18995 |
| 7 | 96433 |
| 8 | 500871 |
| 9 | 2573905 |
| 10 | 13292995 |
| 11 | 68492073 |
| 12 | 353290343 |
| 13 | 1821383097 |
| 14 | 9392360019 |
| 15 | 48428332641 |
| 16 | 249716406791 |
| 17 | 1287608913057 |
| 18 | 6639354593123 |
| 19 | 34234612471001 |
| 20 | 176524935990503 |
| 21 | 910219628918665 |
| 22 | 4693389213891699 |
| 23 | 24200638961917201 |