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 | 0 |
| 2 | 21 |
| 3 | 504 |
| 4 | 597 |
| 5 | 704 |
| 6 | 3441 |
| 7 | 3980 |
| 8 | 4601 |
| 9 | 20540 |
| 10 | 23681 |
| 11 | 27300 |
| 12 | 120197 |
| 13 | 138504 |
| 14 | 159597 |
| 15 | 701040 |
| 16 | 807741 |
| 17 | 930680 |
| 18 | 4086441 |
| 19 | 4708340 |
| 20 | 5424881 |
| 21 | 23818004 |
| 22 | 27442697 |
| 23 | 31619004 |
| 24 | 138821981 |
| 25 | 159948240 |
| 26 | 184289541 |
| 27 | 809114280 |
| 28 | 932247141 |
| 29 | 1074118640 |