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 | 10 |
| 2 | 26 |
| 3 | 79 |
| 4 | 252 |
| 5 | 796 |
| 6 | 2468 |
| 7 | 7564 |
| 8 | 23012 |
| 9 | 69676 |
| 10 | 210308 |
| 11 | 633484 |
| 12 | 1905572 |
| 13 | 5726956 |
| 14 | 17201348 |
| 15 | 51645004 |
| 16 | 155016932 |
| 17 | 465214636 |
| 18 | 1395971588 |
| 19 | 4188570124 |
| 20 | 12567021092 |
| 21 | 37703684716 |
| 22 | 113116297028 |
| 23 | 339359376844 |
| 24 | 1018099102052 |
| 25 | 3054339249196 |
| 26 | 9163101633668 |
| 27 | 27489472673164 |