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A318532
Number of finite sets of set partitions of {1,...,n} such that any two have meet {{1},...,{n}} and join {{1,...,n}}.
2
2, 4, 11, 51, 635, 15591
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OFFSET
1,1
LINKS
Table of n, a(n) for n=1..6.
EXAMPLE
The a(3) = 11 sets of set partitions:
0
{{1,2,3}}
{{1,3},{2}}
{{1,2},{3}}
{{1},{2,3}}
{{1},{2},{3}}
{{1,2},{3}} {{1,3},{2}}
{{1},{2,3}} {{1,3},{2}}
{{1},{2,3}} {{1,2},{3}}
{{1},{2},{3}} {{1,2,3}}
{{1},{2,3}} {{1,2},{3}} {{1,3},{2}}
CROSSREFS
Cf.
A000110
,
A000258
,
A008277
,
A059849
,
A060639
,
A096827
,
A181939
.
Cf.
A318389
,
A318390
,
A318391
,
A318392
,
A318394
,
A318531
.
Sequence in context:
A096119
A117157
A267013
*
A057857
A352969
A091233
Adjacent sequences:
A318529
A318530
A318531
*
A318533
A318534
A318535
KEYWORD
nonn
,
more
AUTHOR
Gus Wiseman
, Aug 28 2018
STATUS
approved
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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)