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 | 30 |
| 1 | 181 |
| 2 | 10890 |
| 3 | 65521 |
| 4 | 3942150 |
| 5 | 23718421 |
| 6 | 1427047410 |
| 7 | 8586002881 |
| 8 | 516587220270 |
| 9 | 3108109324501 |
| 10 | 187003146690330 |
| 11 | 1125126989466481 |
| 12 | 67694622514679190 |
| 13 | 407292862077541621 |
| 14 | 24505266347167176450 |
| 15 | 147438890945080600321 |
| 16 | 8870838723052003195710 |