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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 51 |
| 6 | 176 |
| 7 | 807 |
| 8 | 3232 |
| 9 | 17449 |
| 10 | 78384 |
| 11 | 479897 |
| 12 | 2366248 |
| 13 | 16041147 |
| 14 | 85534176 |
| 15 | 631596455 |
| 16 | 3602770400 |
| 17 | 28633529345 |
| 18 | 173300710720 |
| 19 | 1469070416505 |
| 20 | 9373542317760 |
| 21 | 84152568224563 |
| 22 | 563142033172480 |
| 23 | 5323835899152567 |
| 24 | 37206559614499840 |
| 25 | 368667413713034441 |
| 26 | 2681213937595142656 |