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A209055 Number of nX1 1..6 arrays with every element value z a city block distance of exactly z from another element value z 1
0, 1, 1, 3, 3, 16, 24, 98, 161, 515, 956, 2641, 5686, 14869, 33986, 84574, 196092, 474284, 1110888, 2665506, 6280574, 15027417, 35701279, 85266546, 202157753, 480306818, 1140496671, 2711160051, 6442522473, 15326524978, 36425732326 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Column 1 of A209058

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A209020 A258204 A258017 * A209212 A222847 A278309

Adjacent sequences:  A209052 A209053 A209054 * A209056 A209057 A209058

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 04 2012

STATUS

approved

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Last modified July 1 22:23 EDT 2022. Contains 354984 sequences. (Running on oeis4.)