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 | 14 |
| 3 | 63 |
| 4 | 220 |
| 5 | 701 |
| 6 | 2154 |
| 7 | 6523 |
| 8 | 19640 |
| 9 | 59001 |
| 10 | 177094 |
| 11 | 531383 |
| 12 | 1594260 |
| 13 | 4782901 |
| 14 | 14348834 |
| 15 | 43046643 |
| 16 | 129140080 |
| 17 | 387420401 |
| 18 | 1162261374 |
| 19 | 3486784303 |
| 20 | 10460353100 |
| 21 | 31381059501 |
| 22 | 94143178714 |
| 23 | 282429536363 |
| 24 | 847288609320 |
| 25 | 2541865828201 |
| 26 | 7625597484854 |
| 27 | 22876792454823 |
| 28 | 68630377364740 |