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A190931 Number of permutations of n copies of 1..7 introduced in order 1..7 with no element equal to another within a distance of 5 1
1, 80, 6976, 639552, 60656016, 5898286349, 585487585760, 59147199364720, 6067259409345901, 630842897289489196, 66388460469198215359, 7062901351795999772739, 758832478269321359233282 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..25

EXAMPLE

Some solutions for n=2

..1....1....1....1....1....1....1....1....1....1....1....1....1....1....1....1

..2....2....2....2....2....2....2....2....2....2....2....2....2....2....2....2

..3....3....3....3....3....3....3....3....3....3....3....3....3....3....3....3

..4....4....4....4....4....4....4....4....4....4....4....4....4....4....4....4

..5....5....5....5....5....5....5....5....5....5....5....5....5....5....5....5

..6....6....6....6....6....6....6....6....6....6....6....6....6....6....6....6

..1....7....7....1....7....7....7....1....7....1....7....7....7....7....7....7

..7....2....1....7....1....1....1....7....1....7....1....1....1....2....1....1

..2....1....2....2....2....2....3....3....2....3....2....2....2....3....3....2

..3....3....4....3....3....3....2....4....3....2....4....4....3....1....4....3

..4....4....3....5....5....4....5....2....4....5....3....5....5....4....2....5

..5....5....5....6....6....5....6....5....6....6....6....6....4....5....5....6

..6....6....7....4....4....6....7....6....7....4....5....7....6....7....6....7

..7....7....6....7....7....7....4....7....5....7....7....3....7....6....7....4

CROSSREFS

Sequence in context: A216987 A283102 A259076 * A006202 A278736 A116252

Adjacent sequences:  A190928 A190929 A190930 * A190932 A190933 A190934

KEYWORD

nonn

AUTHOR

R. H. Hardin May 23 2011

STATUS

approved

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Last modified December 13 17:13 EST 2019. Contains 329970 sequences. (Running on oeis4.)