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 | 5 |
| 2 | 49 |
| 3 | 34 |
| 4 | 173 |
| 5 | 453 |
| 6 | 1223 |
| 7 | 3286 |
| 8 | 9873 |
| 9 | 28227 |
| 10 | 86428 |
| 11 | 253623 |
| 12 | 766882 |
| 13 | 2299579 |
| 14 | 6887900 |
| 15 | 20699158 |
| 16 | 62239664 |
| 17 | 186995764 |
| 18 | 562324870 |
| 19 | 1690827365 |
| 20 | 5083949541 |
| 21 | 15289512249 |
| 22 | 45981730995 |
| 23 | 138278962826 |
| 24 | 415872244403 |
| 25 | 1250740118045 |