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A223997
Number of nX6 0..2 arrays with antidiagonals unimodal and rows and diagonals nondecreasing
1
28, 469, 4614, 36845, 281271, 2160036, 16795265, 131782267, 1040869367, 8260503068, 65781844983, 525128814213, 4199218263977, 33618978354499, 269371779362318, 2159531269883408, 17319319103903054, 138936031415524052
OFFSET
1,1
COMMENTS
Column 6 of A223999
LINKS
FORMULA
Empirical: a(n) = 28*a(n-1) -300*a(n-2) +1417*a(n-3) -1482*a(n-4) -11436*a(n-5) +31851*a(n-6) +52359*a(n-7) -290782*a(n-8) +153075*a(n-9) +602260*a(n-10) -176604*a(n-11) -1863678*a(n-12) +536713*a(n-13) +8514601*a(n-14) -7251292*a(n-15) -64571700*a(n-16) +163992784*a(n-17) -63488599*a(n-18) +75157211*a(n-19) -574679221*a(n-20) +1117201234*a(n-21) -1103109981*a(n-22) +247796355*a(n-23) -1415805562*a(n-24) +12828520548*a(n-25) -5049431870*a(n-26) +5717879992*a(n-27) +7921013636*a(n-28) +14497424532*a(n-29) -1161322200*a(n-30) +7782865280*a(n-31) +2703305984*a(n-32) +21857003968*a(n-33) +1446146688*a(n-34) +6372675072*a(n-35) -1634756608*a(n-36) +2474711040*a(n-37) -114278400*a(n-38) +967065600*a(n-39) for n>44
EXAMPLE
Some solutions for n=3
..0..0..0..1..2..2....0..0..1..1..2..2....0..0..0..0..0..0....0..0..0..1..1..1
..2..2..2..2..2..2....0..1..1..2..2..2....0..1..1..2..2..2....0..0..0..1..1..2
..0..2..2..2..2..2....0..1..1..1..2..2....1..2..2..2..2..2....0..0..0..1..1..1
CROSSREFS
Sequence in context: A115226 A086782 A115225 * A263949 A240463 A140107
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 30 2013
STATUS
approved