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) |
|---|---|
| 1 | 5 |
| 2 | 15 |
| 3 | 57 |
| 4 | 188 |
| 5 | 544 |
| 6 | 1380 |
| 7 | 3172 |
| 8 | 6687 |
| 9 | 13163 |
| 10 | 24435 |
| 11 | 43195 |
| 12 | 73194 |
| 13 | 119616 |
| 14 | 189346 |
| 15 | 291486 |
| 16 | 437723 |
| 17 | 642977 |
| 18 | 925889 |
| 19 | 1309647 |
| 20 | 1822576 |
| 21 | 2499166 |
| 22 | 3380806 |
| 23 | 4517000 |
| 24 | 5966265 |
| 25 | 7797585 |
| 26 | 10091447 |
| 27 | 12941561 |
| 28 | 16456084 |
| 29 | 20759580 |
| 30 | 25994452 |
| 31 | 32323204 |