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A222157 Number of nX5 arrays with each row a permutation of 1..5 having at least as many downsteps as the preceding row, with rows in lexicographically nondecreasing order 1
120, 6322, 207262, 4907711, 91075868, 1393742886, 18203084280, 207961261268, 2116883443548, 19475385665260, 163788555854232, 1270883781907016, 9168186853827174, 61890082396969113, 393107547309424404 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A222159

LINKS

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

R. H. Hardin, Formula for A222157

FORMULA

See link for formula

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A289292 A061541 A003438 * A092710 A177758 A055213

Adjacent sequences:  A222154 A222155 A222156 * A222158 A222159 A222160

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 10 2013

STATUS

approved

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Last modified December 6 19:22 EST 2019. Contains 329809 sequences. (Running on oeis4.)