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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 11 |
| 5 | 25 |
| 6 | 79 |
| 7 | 245 |
| 8 | 869 |
| 9 | 2692 |
| 10 | 9544 |
| 11 | 32065 |
| 12 | 115381 |
| 13 | 400023 |
| 14 | 1462730 |
| 15 | 5165327 |
| 16 | 19165035 |
| 17 | 68635477 |
| 18 | 255546242 |
| 19 | 930138521 |
| 20 | 3491772737 |
| 21 | 12810761323 |
| 22 | 48334512920 |
| 23 | 178987624513 |
| 24 | 678272753284 |
| 25 | 2528210175630 |
| 26 | 9616904064021 |
| 27 | 36047930953482 |
| 28 | 137654448221760 |
| 29 | 518401146543811 |