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 | 10 |
| 2 | 60 |
| 3 | 282 |
| 4 | 1149 |
| 5 | 4272 |
| 6 | 14932 |
| 7 | 49996 |
| 8 | 162369 |
| 9 | 515886 |
| 10 | 1613316 |
| 11 | 4987542 |
| 12 | 15290461 |
| 13 | 46592452 |
| 14 | 141350412 |
| 15 | 427459320 |
| 16 | 1289718225 |
| 17 | 3884883570 |
| 18 | 11688205420 |
| 19 | 35135919730 |
| 20 | 105558754461 |
| 21 | 316995030840 |
| 22 | 951656181540 |