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 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 24 |
| 5 | 74 |
| 6 | 277 |
| 7 | 997 |
| 8 | 4016 |
| 9 | 16029 |
| 10 | 68802 |
| 11 | 296740 |
| 12 | 1347175 |
| 13 | 6185975 |
| 14 | 29530010 |
| 15 | 143008050 |
| 16 | 714469780 |
| 17 | 3625572745 |
| 18 | 18884279461 |
| 19 | 99936069760 |
| 20 | 540947985741 |
| 21 | 2974463266900 |
| 22 | 16686653393208 |
| 23 | 95053009906135 |
| 24 | 551356966419818 |
| 25 | 3245644584299434 |
| 26 | 19425857465136193 |