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 | 5 |
| 3 | 14 |
| 4 | 40 |
| 5 | 101 |
| 6 | 266 |
| 7 | 649 |
| 8 | 1593 |
| 9 | 3765 |
| 10 | 8813 |
| 11 | 20168 |
| 12 | 45649 |
| 13 | 101591 |
| 14 | 223654 |
| 15 | 486046 |
| 16 | 1045541 |
| 17 | 2225167 |
| 18 | 4692421 |
| 19 | 9804734 |
| 20 | 20318249 |
| 21 | 41766843 |
| 22 | 85218989 |
| 23 | 172628766 |
| 24 | 347338117 |
| 25 | 694330731 |
| 26 | 1379437080 |
| 27 | 2724353422 |
| 28 | 5350185097 |
| 29 | 10449901555 |
| 30 | 20304465729 |
| 31 | 39254599832 |