

A322308


Number of permutations sigma such that sigma(i+j)sigma(i) >= 5 for 1 <= i <= n  j, 1 <= j <= 4.


1



1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 128, 6320, 344872
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OFFSET

0,26


COMMENTS

2  a(n) for n > 1.


LINKS

Table of n, a(n) for n=0..28.


EXAMPLE

a(25) = 2: [5,10,15,20,25,4,9,14,19,24,3,8,13,18,23,2,7,12,17,22,1,6,11,16,21] and its reverse.


CROSSREFS

Cf. A179958, A279214, A322281.
Sequence in context: A106320 A106318 A202748 * A277757 A010367 A024344
Adjacent sequences: A322305 A322306 A322307 * A322309 A322310 A322311


KEYWORD

nonn,more


AUTHOR

Seiichi Manyama, Dec 03 2018


STATUS

approved



