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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 7 |
| 7 | 22 |
| 8 | 57 |
| 9 | 127 |
| 10 | 258 |
| 11 | 518 |
| 12 | 1123 |
| 13 | 2718 |
| 14 | 7008 |
| 15 | 18054 |
| 16 | 44969 |
| 17 | 108189 |
| 18 | 255919 |
| 19 | 609179 |
| 20 | 1482210 |
| 21 | 3689155 |
| 22 | 9294440 |
| 23 | 23419705 |
| 24 | 58639835 |
| 25 | 145948111 |
| 26 | 362721386 |
| 27 | 904673836 |
| 28 | 2270287636 |
| 29 | 5729191861 |
| 30 | 14502873988 |
| 31 | 36735974548 |
| 32 | 93001413353 |
| 33 | 235372519273 |