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 | 23 |
| 3 | 101 |
| 4 | 436 |
| 5 | 1871 |
| 6 | 8014 |
| 7 | 34309 |
| 8 | 146868 |
| 9 | 628708 |
| 10 | 2691401 |
| 11 | 11521603 |
| 12 | 49323052 |
| 13 | 211148530 |
| 14 | 903912916 |
| 15 | 3869592721 |
| 16 | 16565477544 |
| 17 | 70915744968 |
| 18 | 303585747088 |
| 19 | 1299631069856 |
| 20 | 5563637060865 |
| 21 | 23817572559345 |
| 22 | 101961496787621 |