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 | 16 |
| 2 | 178 |
| 3 | 1498 |
| 4 | 10980 |
| 5 | 85138 |
| 6 | 655090 |
| 7 | 5115398 |
| 8 | 39914386 |
| 9 | 312388874 |
| 10 | 2436283602 |
| 11 | 18994966598 |
| 12 | 148059349634 |
| 13 | 1154792660474 |
| 14 | 9007078544234 |
| 15 | 70254124462638 |
| 16 | 547921292697778 |
| 17 | 4273303250042966 |
| 18 | 33327954035543034 |
| 19 | 259932116476519958 |
| 20 | 2027268764564330754 |