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 | 4 |
| 2 | 75 |
| 3 | 604 |
| 4 | 3150 |
| 5 | 12480 |
| 6 | 40788 |
| 7 | 115500 |
| 8 | 292578 |
| 9 | 677820 |
| 10 | 1459315 |
| 11 | 2954952 |
| 12 | 5679700 |
| 13 | 10438272 |
| 14 | 18449760 |
| 15 | 31511880 |
| 16 | 52213596 |
| 17 | 84206100 |
| 18 | 132543411 |
| 19 | 204105220 |
| 20 | 308116050 |
| 21 | 456776320 |
| 22 | 666022500 |
| 23 | 956435220 |
| 24 | 1354315950 |
| 25 | 1892954700 |
| 26 | 2614113099 |
| 27 | 3569749200 |
| 28 | 4824012424 |