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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 7 |
| 7 | 15 |
| 8 | 37 |
| 9 | 91 |
| 10 | 231 |
| 11 | 593 |
| 12 | 1557 |
| 13 | 4111 |
| 14 | 10941 |
| 15 | 29295 |
| 16 | 79087 |
| 17 | 215015 |
| 18 | 587463 |
| 19 | 1611985 |
| 20 | 4441473 |
| 21 | 12284513 |
| 22 | 34095797 |
| 23 | 94931525 |
| 24 | 265061363 |
| 25 | 742029431 |
| 26 | 2082310665 |
| 27 | 5856540305 |
| 28 | 16505796865 |
| 29 | 46608877763 |
| 30 | 131850193107 |
| 31 | 373612733107 |
| 32 | 1060339387939 |
| 33 | 3013758348317 |