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 | 61 |
| 1 | 1385 |
| 2 | 12284 |
| 3 | 68060 |
| 4 | 281210 |
| 5 | 948002 |
| 6 | 2749340 |
| 7 | 7097948 |
| 8 | 16700255 |
| 9 | 36419955 |
| 10 | 74551048 |
| 11 | 144631240 |
| 12 | 267951892 |
| 13 | 476948260 |
| 14 | 819683560 |
| 15 | 1365672424 |
| 16 | 2213323585 |
| 17 | 3499318141 |
| 18 | 5410278500 |
| 19 | 8197124100 |