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 | 10 |
| 3 | 15 |
| 4 | 55 |
| 5 | 105 |
| 6 | 5050 |
| 7 | 5151 |
| 8 | 10011 |
| 9 | 15051 |
| 10 | 105111 |
| 11 | 500500 |
| 12 | 501501 |
| 13 | 505515 |
| 14 | 510555 |
| 15 | 10015050 |
| 16 | 50005000 |
| 17 | 50015001 |
| 18 | 50055015 |
| 19 | 50105055 |
| 20 | 51010050 |
| 21 | 51111105 |
| 22 | 51151555 |
| 23 | 110551015 |
| 24 | 1051501011 |
| 25 | 1505550501 |
| 26 | 5000050000 |
| 27 | 5000150001 |
| 28 | 5000550015 |
| 29 | 5001050055 |
| 30 | 5010055050 |