A107953 - cp's OEIS frontend

A107953 Number of chains in the power set lattice of an (n+3)-element set X_(n+3) of specification n^1 2^1 1, that is, n identical objects of one kind, 2 identical objects of another kind and one other kind. It is the same as the number of fuzzy subsets X_(n+3).

n	a(n)
0	31
1	175
2	703
3	2415
4	7551
5	22143
6	61951
7	167167
8	438271
9	1122303
10	2818047
11	6959103
12	16941055
13	40730623
14	96862207
15	228130815
16	532676607
17	1234173951
18	2839543807
19	6491734015
20	14755561471
21	33361494015
22	75061264383
23	168124481535
24	375004332031
25	833223655423

[31, 175, 703, 2415, 7551, 22143, 61951, 167167, 438271, 1122303, 2818047, 6959103, 16941055, 40730623, 96862207, 228130815, 532676607, 1234173951, 2839543807, 6491734015, 14755561471, 33361494015, 75061264383, 168124481535, 375004332031, 833223655423]

cp's OEIS Frontend

A107953 Number of chains in the power set lattice of an (n+3)-element set X_(n+3) of specification n^1 2^1 1, that is, n identical objects of one kind, 2 identical objects of another kind and one other kind. It is the same as the number of fuzzy subsets X_(n+3).

Table of values

List of values