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 | 8 |
| 2 | 46 |
| 3 | 303 |
| 4 | 5133 |
| 5 | 17984 |
| 6 | 216816 |
| 7 | 1270607 |
| 8 | 41146179 |
| 9 | 420243162 |
| 10 | 2524038155 |
| 11 | 36159205628 |
| 12 | 343392568900 |
| 13 | 1955010428258 |
| 14 | 15237833654620 |
| 15 | 260219446617109 |
| 16 | 2621513397605657 |
| 17 | 24619309639366177 |
| 18 | 233874804775621799 |
| 19 | 684559920583084690 |
| 20 | 20920441130654929928 |
| 21 | 200085344903558463823 |