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 | 3 |
| 2 | 7 |
| 3 | 13 |
| 4 | 34 |
| 5 | 78 |
| 6 | 237 |
| 7 | 687 |
| 8 | 2299 |
| 9 | 7685 |
| 10 | 27190 |
| 11 | 96909 |
| 12 | 353384 |
| 13 | 1296858 |
| 14 | 4808707 |
| 15 | 17920860 |
| 16 | 67169299 |
| 17 | 252745368 |
| 18 | 954677597 |
| 19 | 3617214681 |
| 20 | 13744852240 |
| 21 | 52359294790 |
| 22 | 199915018057 |
| 23 | 764884036743 |
| 24 | 2932046213314 |
| 25 | 11259024569838 |
| 26 | 43303903226962 |
| 27 | 166800088109829 |