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 | 13 |
| 3 | 21 |
| 4 | 26 |
| 5 | 64 |
| 6 | 115 |
| 7 | 211 |
| 8 | 439 |
| 9 | 870 |
| 10 | 1725 |
| 11 | 3513 |
| 12 | 7141 |
| 13 | 14372 |
| 14 | 29438 |
| 15 | 60518 |
| 16 | 123439 |
| 17 | 253860 |
| 18 | 523477 |
| 19 | 1075787 |
| 20 | 2216143 |
| 21 | 4575316 |
| 22 | 9438222 |
| 23 | 19480290 |
| 24 | 40253428 |
| 25 | 83178619 |
| 26 | 171897255 |
| 27 | 355448881 |
| 28 | 735100437 |
| 29 | 1520380599 |
| 30 | 3145360038 |
| 31 | 6508033432 |