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 | 7 |
| 3 | 28 |
| 4 | 84 |
| 5 | 210 |
| 6 | 462 |
| 7 | 924 |
| 8 | 1716 |
| 9 | 3003 |
| 10 | 5004 |
| 11 | 7995 |
| 12 | 12306 |
| 13 | 18312 |
| 14 | 26418 |
| 15 | 37038 |
| 16 | 50568 |
| 17 | 67353 |
| 18 | 87648 |
| 19 | 111573 |
| 20 | 139068 |
| 21 | 169863 |
| 22 | 203463 |
| 23 | 239148 |
| 24 | 275988 |
| 25 | 312873 |
| 26 | 348558 |
| 27 | 381723 |
| 28 | 411048 |
| 29 | 435303 |
| 30 | 453438 |
| 31 | 464653 |
| 32 | 468448 |
| 33 | 464653 |
| 34 | 453438 |
| 35 | 435303 |
| 36 | 411048 |
| 37 | 381723 |
| 38 | 348558 |
| 39 | 312873 |
| 40 | 275988 |
| 41 | 239148 |
| 42 | 203463 |
| 43 | 169863 |
| 44 | 139068 |
| 45 | 111573 |
| 46 | 87648 |
| 47 | 67353 |
| 48 | 50568 |
| 49 | 37038 |
| 50 | 26418 |
| 51 | 18312 |
| 52 | 12306 |
| 53 | 7995 |
| 54 | 5004 |
| 55 | 3003 |
| 56 | 1716 |
| 57 | 924 |
| 58 | 462 |
| 59 | 210 |
| 60 | 84 |
| 61 | 28 |
| 62 | 7 |
| 63 | 1 |