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 | 1 |
| 2 | 8 |
| 3 | 41 |
| 4 | 176 |
| 5 | 689 |
| 6 | 2552 |
| 7 | 9113 |
| 8 | 31712 |
| 9 | 108257 |
| 10 | 364136 |
| 11 | 1210505 |
| 12 | 3985808 |
| 13 | 13020305 |
| 14 | 42249560 |
| 15 | 136314617 |
| 16 | 437641664 |
| 17 | 1399018433 |
| 18 | 4455335624 |
| 19 | 14140847849 |
| 20 | 44747066480 |
| 21 | 141214768241 |
| 22 | 444565011128 |
| 23 | 1396457152601 |
| 24 | 4377657815456 |
| 25 | 13697832519329 |
| 26 | 42788074776872 |
| 27 | 133447955987273 |
| 28 | 415595062931792 |
| 29 | 1292538773705297 |
| 30 | 4014877075845656 |