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 | 3 |
| 2 | 6 |
| 3 | 10 |
| 4 | 21 |
| 5 | 42 |
| 6 | 103 |
| 7 | 237 |
| 8 | 603 |
| 9 | 1519 |
| 10 | 3942 |
| 11 | 10257 |
| 12 | 27131 |
| 13 | 71940 |
| 14 | 192462 |
| 15 | 516933 |
| 16 | 1395636 |
| 17 | 3781356 |
| 18 | 10283911 |
| 19 | 28050600 |
| 20 | 76732047 |
| 21 | 210414811 |
| 22 | 578330649 |
| 23 | 1592821005 |
| 24 | 4395261552 |
| 25 | 12149386569 |
| 26 | 33637309323 |
| 27 | 93267459520 |
| 28 | 258961863288 |
| 29 | 719938597227 |
| 30 | 2003881480452 |
| 31 | 5583818718102 |
| 32 | 15575529493713 |