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 | 3 |
| 3 | 7 |
| 4 | 19 |
| 5 | 47 |
| 6 | 130 |
| 7 | 343 |
| 8 | 951 |
| 9 | 2615 |
| 10 | 7318 |
| 11 | 20491 |
| 12 | 57903 |
| 13 | 163898 |
| 14 | 466199 |
| 15 | 1328993 |
| 16 | 3799624 |
| 17 | 10884049 |
| 18 | 31241170 |
| 19 | 89814958 |
| 20 | 258604642 |
| 21 | 745568756 |
| 22 | 2152118306 |
| 23 | 6218869389 |
| 24 | 17988233052 |
| 25 | 52078309200 |
| 26 | 150899223268 |
| 27 | 437571896993 |
| 28 | 1269755237948 |
| 29 | 3687025544605 |
| 30 | 10712682919341 |
| 31 | 31143566495273 |
| 32 | 90587953109272 |
| 33 | 263627037547365 |