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 | 4 |
| 3 | 14 |
| 4 | 50 |
| 5 | 181 |
| 6 | 657 |
| 7 | 2385 |
| 8 | 8657 |
| 9 | 31422 |
| 10 | 114051 |
| 11 | 413966 |
| 12 | 1502555 |
| 13 | 5453761 |
| 14 | 19795288 |
| 15 | 71850128 |
| 16 | 260791401 |
| 17 | 946583628 |
| 18 | 3435774958 |
| 19 | 12470688498 |
| 20 | 45264335853 |
| 21 | 164294064481 |
| 22 | 596331286321 |
| 23 | 2164478699633 |
| 24 | 7856317702310 |
| 25 | 28515747394555 |
| 26 | 103502414271126 |