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A190930 Number of permutations of n copies of 1..7 introduced in order 1..7 with no element equal to another within a distance of 4 1
1, 876, 930776, 1121366420, 1480802920785, 2096040262602013, 3130500265589863279, 4877720372114515794195, 7863552772351099534263185, 13036319691799230161857187106, 22121167328810053450410257014723 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..17

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....1....6....6....6....6....6....1....6....6....6....6

..7....7....7....7....7....6....7....1....7....7....7....6....7....2....1....2

..1....2....3....2....1....3....1....3....1....3....2....7....2....7....7....7

..2....4....4....4....3....7....4....7....4....4....3....2....4....3....3....1

..3....5....2....1....2....4....3....5....5....1....4....4....3....5....5....5

..4....1....6....6....6....5....6....4....3....2....5....3....6....1....2....4

..6....3....5....3....5....2....7....6....2....5....7....6....5....4....6....6

..5....6....1....5....7....6....2....2....6....6....1....7....1....6....4....7

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

CROSSREFS

Sequence in context: A297511 A297725 A185989 * A209743 A346900 A346884

Adjacent sequences:  A190927 A190928 A190929 * A190931 A190932 A190933

KEYWORD

nonn

AUTHOR

R. H. Hardin May 23 2011

STATUS

approved

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Last modified May 16 19:04 EDT 2022. Contains 353720 sequences. (Running on oeis4.)