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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.

A379706 Number of nonempty labeled antichains of subsets of [n] such that the largest subset is of size 2.

Table of values

n a(n)
0 0
1 0
2 1
3 10
4 97
5 1418
6 40005
7 2350474
8 286192257
9 71213783154
10 35883905262757
11 36419649682704418
12 74221659280476132145
13 303193505953871645554778
14 2480118046704094643352342117
15 40601989176407026666590990389338
16 1329877330167226219547875498464450945
17 87134888326188320631048795061602782878050

List of values

[0, 0, 1, 10, 97, 1418, 40005, 2350474, 286192257, 71213783154, 35883905262757, 36419649682704418, 74221659280476132145, 303193505953871645554778, 2480118046704094643352342117, 40601989176407026666590990389338, 1329877330167226219547875498464450945, 87134888326188320631048795061602782878050]

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

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