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A255097 Number of (n+2)X(4+2) 0..1 arrays with no 3x3 subblock diagonal sum 1 and no antidiagonal sum 1 and no row sum 1 and no column sum 1 1

%I #4 Feb 14 2015 11:56:22

%S 419,1475,6110,25413,106848,454332,1933924,8248373,35227773,150417081,

%T 642360601,2744199183,11723677708,50083292461,213960360261,

%U 914078793470,3905115873457,16683360703840,71274426314113,304497975802593

%N Number of (n+2)X(4+2) 0..1 arrays with no 3x3 subblock diagonal sum 1 and no antidiagonal sum 1 and no row sum 1 and no column sum 1

%C Column 4 of A255101

%H R. H. Hardin, <a href="/A255097/b255097.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 5*a(n-1) -4*a(n-2) +14*a(n-3) -23*a(n-4) -91*a(n-5) -13*a(n-6) -118*a(n-7) +815*a(n-8) +1080*a(n-9) -692*a(n-10) -2103*a(n-11) -5420*a(n-12) +2379*a(n-13) +8473*a(n-14) +4179*a(n-15) +8147*a(n-16) -18588*a(n-17) -30186*a(n-18) +2771*a(n-19) +28308*a(n-20) +32734*a(n-21) +6559*a(n-22) -23299*a(n-23) -16727*a(n-24) -666*a(n-25) +7553*a(n-26) -5973*a(n-27) -14481*a(n-28) +7873*a(n-29) +34754*a(n-30) +25934*a(n-31) -15978*a(n-32) -45920*a(n-33) -43974*a(n-34) -14735*a(n-35) +6402*a(n-36) +15091*a(n-37) +14803*a(n-38) +11460*a(n-39) +9120*a(n-40) +5581*a(n-41) +3303*a(n-42) +1366*a(n-43) +342*a(n-44) +18*a(n-45) -72*a(n-46) for n>50

%e Some solutions for n=4

%e ..1..1..1..1..0..1....1..1..1..1..1..0....1..1..1..0..1..1....0..1..1..1..1..1

%e ..1..1..1..0..1..1....0..1..1..1..1..1....1..0..1..1..1..1....1..1..1..1..1..1

%e ..1..1..0..1..1..1....1..1..1..1..1..1....1..1..1..1..0..1....1..1..1..1..0..1

%e ..1..0..1..1..1..1....1..1..1..1..1..1....1..1..1..1..1..1....1..1..1..1..1..1

%e ..0..1..1..1..1..1....1..1..0..1..1..0....0..1..1..1..1..1....0..1..1..1..1..0

%e ..1..1..0..1..1..0....0..1..1..1..0..1....1..1..1..1..1..1....1..1..1..0..1..1

%Y Cf. A255101

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 14 2015

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Last modified April 19 08:45 EDT 2024. Contains 371782 sequences. (Running on oeis4.)