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A235417 Number of (n+1)X(1+1) 0..2 arrays with 2X2 subblock sum of squares lexicographically nondecreasing rowwise and nonincreasing columnwise 2
81, 432, 2304, 9504, 39204, 138402, 488601, 1553877, 4941729, 14587326, 43059844, 120242088, 335768976, 898407396, 2403842841, 6218691273, 16087624569, 40503112884, 101972926224, 251077339656, 618201642564, 1494166176558 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A235421
LINKS
FORMULA
Empirical: a(n) = 6*a(n-1) +12*a(n-2) -138*a(n-3) +44*a(n-4) +1362*a(n-5) -1706*a(n-6) -7446*a(n-7) +14669*a(n-8) +23808*a(n-9) -69362*a(n-10) -39576*a(n-11) +208600*a(n-12) -417200*a(n-14) +158304*a(n-15) +554896*a(n-16) -380928*a(n-17) -469408*a(n-18) +476544*a(n-19) +218368*a(n-20) -348672*a(n-21) -22528*a(n-22) +141312*a(n-23) -24576*a(n-24) -24576*a(n-25) +8192*a(n-26)
EXAMPLE
Some solutions for n=5
..0..1....0..0....1..1....0..0....2..1....2..1....0..1....0..1....0..0....0..0
..0..2....0..0....0..1....1..0....0..1....0..1....1..0....1..0....1..0....2..0
..0..2....1..1....2..1....0..0....2..1....2..1....1..2....0..1....1..0....1..0
..2..0....2..1....0..1....0..2....1..1....1..1....1..1....0..1....2..0....2..0
..0..2....1..1....2..1....2..1....2..1....1..2....2..2....1..1....1..1....2..1
..2..1....2..2....2..2....2..2....2..2....1..1....2..1....0..1....2..1....2..2
CROSSREFS
Sequence in context: A236698 A235421 A236282 * A237391 A237385 A237308
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 10 2014
STATUS
approved

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Last modified April 12 19:05 EDT 2024. Contains 371636 sequences. (Running on oeis4.)