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A275291 Number of set partitions of [n] with symmetric block size list of length seven. 2
1, 4, 50, 250, 2160, 12256, 91925, 559987, 3939653, 24964844, 170468820, 1104449861, 7440709045, 48835462696, 327230257098, 2164985118201, 14485751773693, 96353703793654, 644984901718337, 4306885857654070, 28868100135841407, 193352040530826181 (list; graph; refs; listen; history; text; internal format)
OFFSET
7,2
LINKS
FORMULA
a(n) ~ 7^(n+1/2) / (5760*Pi^(3/2)*n^(3/2)). - Vaclav Kotesovec, Aug 02 2016
EXAMPLE
a(8) = 4: 1|2|3|45|6|7|8, 1|2|3|46|5|7|8, 1|2|3|47|5|6|8, 1|2|3|48|5|6|7.
CROSSREFS
Column k=7 of A275281.
Sequence in context: A321590 A274872 A189894 * A240396 A197473 A219566
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Jul 22 2016
STATUS
approved

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Last modified March 19 07:04 EDT 2024. Contains 370953 sequences. (Running on oeis4.)