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 | 5 |
| 4 | 11 |
| 5 | 41 |
| 6 | 110 |
| 7 | 393 |
| 8 | 1180 |
| 9 | 4199 |
| 10 | 13538 |
| 11 | 48353 |
| 12 | 163130 |
| 13 | 585790 |
| 14 | 2035789 |
| 15 | 7353701 |
| 16 | 26078670 |
| 17 | 94767692 |
| 18 | 340963400 |
| 19 | 1246208999 |
| 20 | 4531981344 |
| 21 | 16653522634 |
| 22 | 61062317840 |
| 23 | 225484886305 |
| 24 | 832165390554 |
| 25 | 3086496104906 |
| 26 | 11451263408809 |
| 27 | 42640078377086 |
| 28 | 158896249065150 |
| 29 | 593747065988969 |
| 30 | 2220821612331954 |
| 31 | 8324534184912813 |
| 32 | 31236600473715868 |
| 33 | 117415053041080870 |