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 | 12 |
| 3 | 34 |
| 4 | 100 |
| 5 | 246 |
| 6 | 630 |
| 7 | 1433 |
| 8 | 3298 |
| 9 | 7124 |
| 10 | 15283 |
| 11 | 31358 |
| 12 | 64100 |
| 13 | 126406 |
| 14 | 247587 |
| 15 | 472864 |
| 16 | 895548 |
| 17 | 1661690 |
| 18 | 3059734 |
| 19 | 5538991 |
| 20 | 9950980 |
| 21 | 17631398 |
| 22 | 31004004 |
| 23 | 53878023 |
| 24 | 92979904 |
| 25 | 158806852 |
| 26 | 269448833 |
| 27 | 453099946 |
| 28 | 757152246 |
| 29 | 1255180557 |
| 30 | 2068707378 |
| 31 | 3385065586 |