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A260357
a(n) is the minimal value of Sum_{i=1..n} Product_{j=1..6} r_j(i), where each r_j is a permutation of {1,2,...,n}.
3
1, 16, 108, 472, 1564, 4320
OFFSET
1,2
COMMENTS
See arXiv link for sets of permutations that achieve the value of a(n).
CROSSREFS
Cf. A000292 (two permutations), A070735 (three permutations), A070736 (four permutations), A260356 (five permutations), A260358 (seven permutations), A260359 (eight permutations), A260355.
Sequence in context: A083469 A224160 A224411 * A056001 A163725 A269188
KEYWORD
nonn,more
AUTHOR
Chai Wah Wu, Jul 28 2015
STATUS
approved