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 | 20 |
| 3 | 40 |
| 4 | 76 |
| 5 | 147 |
| 6 | 287 |
| 7 | 556 |
| 8 | 1077 |
| 9 | 2091 |
| 10 | 4057 |
| 11 | 7868 |
| 12 | 15264 |
| 13 | 29613 |
| 14 | 57445 |
| 15 | 111438 |
| 16 | 216184 |
| 17 | 419380 |
| 18 | 813563 |
| 19 | 1578253 |
| 20 | 3061693 |
| 21 | 5939450 |
| 22 | 11522085 |
| 23 | 22351978 |
| 24 | 43361147 |
| 25 | 84117349 |
| 26 | 163181309 |
| 27 | 316559417 |
| 28 | 614101361 |
| 29 | 1191310271 |
| 30 | 2311051970 |
| 31 | 4483266305 |