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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 6 |
| 4 | 11 |
| 5 | 62 |
| 6 | 138 |
| 7 | 748 |
| 8 | 1843 |
| 9 | 9718 |
| 10 | 25534 |
| 11 | 131860 |
| 12 | 362430 |
| 13 | 1840940 |
| 14 | 5233460 |
| 15 | 26225496 |
| 16 | 76546627 |
| 17 | 379247782 |
| 18 | 1130801782 |
| 19 | 5548263172 |
| 20 | 16838371978 |
| 21 | 81921368964 |
| 22 | 252369171404 |
| 23 | 1218709491944 |
| 24 | 3802973638254 |
| 25 | 18243641612476 |
| 26 | 57570352319788 |