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A206123 Number of (n+1)X4 0..2 arrays with every 2X2 subblock having nonzero determinant and having the same number of clockwise edge increases as its horizontal and vertical neighbors 1
558, 3692, 25340, 201498, 1622095, 13475116, 112183711, 939358762, 7868519564, 65979083372, 553282676669, 4640551430206, 38922156734987, 326466825617358, 2738306512199386, 22968242764669498, 192652048790354377 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A206128
LINKS
FORMULA
Empirical: a(n) = 6*a(n-1) +72*a(n-2) -352*a(n-3) -1842*a(n-4) +8483*a(n-5) +22782*a(n-6) -111329*a(n-7) -146524*a(n-8) +887675*a(n-9) +408834*a(n-10) -4451798*a(n-11) +555841*a(n-12) +13452774*a(n-13) -6983392*a(n-14) -21422904*a(n-15) +14294732*a(n-16) +15409732*a(n-17) -5535750*a(n-18) -954280*a(n-19) -7463176*a(n-20) -9198940*a(n-21) +4005472*a(n-22) +6349224*a(n-23) +1754032*a(n-24) -47088*a(n-25) -288592*a(n-26) -493376*a(n-27) -708032*a(n-28) -195872*a(n-29) +160192*a(n-30) +95296*a(n-31) +10752*a(n-32) -5376*a(n-33) for n>37
EXAMPLE
Some solutions for n=4
..2..2..1..2....1..1..2..1....2..1..2..2....1..2..0..1....1..1..1..1
..1..2..2..2....1..2..2..2....2..2..2..1....2..0..1..2....2..1..2..0
..2..2..1..2....2..2..1..2....1..2..1..1....2..1..2..0....2..2..2..2
..2..1..1..1....2..1..1..1....2..2..2..0....1..2..0..1....2..1..2..0
..2..2..1..2....1..1..2..0....2..0..2..2....0..1..2..2....2..2..2..2
CROSSREFS
Sequence in context: A071393 A352350 A253290 * A253160 A253478 A253483
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 04 2012
STATUS
approved

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Last modified April 19 11:14 EDT 2024. Contains 371791 sequences. (Running on oeis4.)