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 | 0 |
| 1 | 1356 |
| 2 | 15029 |
| 3 | 90734 |
| 4 | 394506 |
| 5 | 1381695 |
| 6 | 4138827 |
| 7 | 11002068 |
| 8 | 26603148 |
| 9 | 59546487 |
| 10 | 124984860 |
| 11 | 248436188 |
| 12 | 471271892 |
| 13 | 858408642 |
| 14 | 1508851218 |
| 15 | 2569865520 |
| 16 | 4255708464 |
| 17 | 6872006526 |
| 18 | 10847057991 |
| 19 | 16771536474 |
| 20 | 25448295950 |
| 21 | 37954221305 |
| 22 | 55716334245 |
| 23 | 80604653220 |