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) |
|---|---|
| 0 | 1 |
| 1 | 42 |
| 2 | 1225 |
| 3 | 30870 |
| 4 | 722701 |
| 5 | 16235562 |
| 6 | 355888225 |
| 7 | 7683656190 |
| 8 | 164302593301 |
| 9 | 3491636199282 |
| 10 | 73902587019625 |
| 11 | 1560051480424710 |
| 12 | 32874455072382301 |
| 13 | 691950889177526202 |
| 14 | 14553192008156093425 |
| 15 | 305928163614832076430 |