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) |
|---|---|
| 4 | 52 |
| 5 | 472 |
| 6 | 3224 |
| 7 | 18888 |
| 8 | 101340 |
| 9 | 511120 |
| 10 | 2465904 |
| 11 | 11496144 |
| 12 | 52165892 |
| 13 | 231557064 |
| 14 | 1009247192 |
| 15 | 4331502840 |
| 16 | 18346242492 |
| 17 | 76822836544 |
| 18 | 318485778848 |
| 19 | 1308750158016 |
| 20 | 5335993098340 |
| 21 | 21603437175288 |
| 22 | 86912657626392 |
| 23 | 347660876627944 |
| 24 | 1383457374046444 |
| 25 | 5479086968052912 |
| 26 | 21604984733546336 |
| 27 | 84850331177724944 |
| 28 | 332001521469767940 |
| 29 | 1294589169323791912 |
| 30 | 5031934808360234760 |
| 31 | 19500424806065865400 |
| 32 | 75360646947991208396 |
| 33 | 290478417300879735680 |
| 34 | 1116919455364101145920 |
| 35 | 4284817000807140094464 |
| 36 | 16402243457215852326116 |
| 37 | 62659647762404302956856 |
| 38 | 238910441445219175239480 |