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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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified April 8 08:04 EDT 2020. Contains 333313 sequences. (Running on oeis4.)