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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.

A107954 Number of chains in the power set lattice, or the number of fuzzy subsets of an (n+4)-element set X_(n+4) with specification n elements of one kind, 3 elements of another and 1 of yet another kind.

Table of values

n a(n)
0 79
1 527
2 2415
3 9263
4 31871
5 101759
6 307455
7 890111
8 2490367
9 6774783
10 18001919
11 46886911
12 120029183
13 302678015
14 753205247
15 1852375039
16 4507828223
17 10866393087
18 25970081791
19 61583917055
20 144997089279
21 339159810047

List of values

[79, 527, 2415, 9263, 31871, 101759, 307455, 890111, 2490367, 6774783, 18001919, 46886911, 120029183, 302678015, 753205247, 1852375039, 4507828223, 10866393087, 25970081791, 61583917055, 144997089279, 339159810047]

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

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