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) |
|---|---|
| 1 | 6 |
| 2 | 47 |
| 3 | 333 |
| 4 | 2334 |
| 5 | 16340 |
| 6 | 114381 |
| 7 | 800667 |
| 8 | 5604668 |
| 9 | 39232674 |
| 10 | 274628715 |
| 11 | 1922401001 |
| 12 | 13456807002 |
| 13 | 94197649008 |
| 14 | 659383543049 |
| 15 | 4615684801335 |
| 16 | 32309793609336 |
| 17 | 226168555265342 |
| 18 | 1583179886857383 |
| 19 | 11082259208001669 |
| 20 | 77575814456011670 |
| 21 | 543030701192081676 |