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 | 5 |
| 3 | 25 |
| 4 | 119 |
| 5 | 546 |
| 6 | 2442 |
| 7 | 10725 |
| 8 | 46475 |
| 9 | 199342 |
| 10 | 848198 |
| 11 | 3585946 |
| 12 | 15080870 |
| 13 | 63146500 |
| 14 | 263432340 |
| 15 | 1095517485 |
| 16 | 4543460595 |
| 17 | 18798494550 |
| 18 | 77616288750 |
| 19 | 319874637390 |
| 20 | 1316106144210 |
| 21 | 5407045011420 |
| 22 | 22184521682700 |
| 23 | 90910797617250 |
| 24 | 372137346502974 |
| 25 | 1521789223654476 |
| 26 | 6217349014923452 |