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 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 12 |
| 6 | 25 |
| 7 | 50 |
| 8 | 99 |
| 9 | 198 |
| 10 | 400 |
| 11 | 803 |
| 12 | 1605 |
| 13 | 3210 |
| 14 | 6422 |
| 15 | 12848 |
| 16 | 25692 |
| 17 | 51384 |
| 18 | 102784 |
| 19 | 205563 |
| 20 | 411115 |
| 21 | 822234 |
| 22 | 1644470 |
| 23 | 3288958 |
| 24 | 6577915 |
| 25 | 13155768 |
| 26 | 26311537 |
| 27 | 52623102 |
| 28 | 105246259 |
| 29 | 210492628 |
| 30 | 420985102 |
| 31 | 841970065 |
| 32 | 1683940202 |
| 33 | 3367880511 |
| 34 | 6735761133 |
| 35 | 13471522233 |