cp's OEIS Frontend

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.

A367494 Number of (2+2)-free naturally labeled posets on [n].

Table of values

n a(n)
0 1
1 1
2 2
3 7
4 37
5 272
6 2637
7 32469
8 493602
9 9062503
10 197409097
11 5027822588
12 147896295785
13 4972353491993
14 189357434418082
15 8104194176872583
16 387121098095180237
17 20513320778472547576
18 1199236185075846230469
19 76970026071431034905229
20 5399593095642890354948802

List of values

[1, 1, 2, 7, 37, 272, 2637, 32469, 493602, 9062503, 197409097, 5027822588, 147896295785, 4972353491993, 189357434418082, 8104194176872583, 387121098095180237, 20513320778472547576, 1199236185075846230469, 76970026071431034905229, 5399593095642890354948802]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.