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 | 2 |
| 3 | 4 |
| 4 | 6 |
| 5 | 11 |
| 6 | 18 |
| 7 | 31 |
| 8 | 54 |
| 9 | 97 |
| 10 | 172 |
| 11 | 309 |
| 12 | 564 |
| 13 | 1028 |
| 14 | 1900 |
| 15 | 3512 |
| 16 | 6542 |
| 17 | 12251 |
| 18 | 23000 |
| 19 | 43390 |
| 20 | 82025 |
| 21 | 155611 |
| 22 | 295947 |
| 23 | 564163 |
| 24 | 1077871 |
| 25 | 2063689 |
| 26 | 3957809 |
| 27 | 7603553 |
| 28 | 14630843 |
| 29 | 28192750 |
| 30 | 54400028 |
| 31 | 105097565 |
| 32 | 203280221 |
| 33 | 393615806 |
| 34 | 762939111 |
| 35 | 1480206279 |
| 36 | 2874398515 |
| 37 | 5586502348 |
| 38 | 10866266172 |
| 39 | 21151907950 |
| 40 | 41203088796 |
| 41 | 80316571436 |
| 42 | 156661034233 |
| 43 | 305761713237 |
| 44 | 597116381732 |
| 45 | 1166746786182 |
| 46 | 2280998753949 |
| 47 | 4461632979717 |
| 48 | 8731188863470 |
| 49 | 17094432576778 |
| 50 | 33483379603407 |
| 51 | 65612899915304 |
| 52 | 128625503610475 |