|
|
A270958
|
|
Number of set partitions of [n] having exactly four pairs (m,m+1) such that m+1 is in some block b and m is in block b+1.
|
|
2
|
|
|
10, 174, 1783, 15158, 121464, 965616, 7776877, 64017975, 540759958, 4695640591, 41947390960, 385584558062, 3646493831801, 35466401895010, 354594794206614, 3642294128252241, 38413175987708429, 415694601586123128, 4612983463942832627, 52460139965678764835
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
8,1
|
|
LINKS
|
|
|
EXAMPLE
|
a(8) = 10: 1358|247|6, 1368|257|4, 136|258|47, 136|25|48|7, 138|257|46, 13|258|47|6, 138|27|46|5, 158|247|36, 15|248|37|6, 18|247|36|5.
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|