A252072 Number of (n+2)X(5+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 or 4

767, 3029, 17455, 92225, 480464, 2547765, 13460641, 71027923, 375675345, 1985308056, 10482759501, 55378851635, 292644335776, 1546162330278, 8168095347950, 43152835319630, 227991513370743, 1204546728063178

Offset

1,1

Comments

Column 5 of A252075

Links

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

Formula

Empirical: a(n) = 2*a(n-1) +2*a(n-2) +39*a(n-3) +181*a(n-4) +262*a(n-5) +238*a(n-6) -1529*a(n-7) -4996*a(n-8) -1940*a(n-9) +5551*a(n-10) +17305*a(n-11) +23836*a(n-12) -26075*a(n-13) -64360*a(n-14) -11102*a(n-15) +51639*a(n-16) +81824*a(n-17) +35975*a(n-18) -53399*a(n-19) -80282*a(n-20) -59920*a(n-21) -23443*a(n-22) +72246*a(n-23) +40762*a(n-24) -1573*a(n-25) +23887*a(n-26) -59858*a(n-27) +34106*a(n-28) -6361*a(n-29) -81*a(n-30) +24130*a(n-31) -31441*a(n-32) +25513*a(n-33) -20671*a(n-34) +14968*a(n-35) -8162*a(n-36) +4626*a(n-37) -2679*a(n-38) +1036*a(n-39) -411*a(n-40) +180*a(n-41) -13*a(n-42) -16*a(n-43) +5*a(n-44) for n>46

Example

Some solutions for n=4
..2..2..2..1..2..2..2....2..2..2..2..1..2..2....2..2..2..2..2..2..1
..2..1..2..2..2..1..2....2..1..2..2..2..2..2....1..2..2..2..1..2..2
..2..2..2..2..2..2..2....2..2..2..2..2..1..2....2..2..2..2..2..2..2
..2..2..1..2..2..2..1....2..2..1..2..2..2..2....2..2..2..2..2..2..2
..2..2..2..2..2..2..2....1..2..2..2..2..2..1....1..2..2..2..2..2..1
..2..2..2..1..2..2..2....2..1..2..2..2..2..2....2..1..2..2..2..2..2

Crossrefs

Sequence in context: A159209 A045142 A115934 * A200856 A116301 A219225

Adjacent sequences: A252069 A252070 A252071 * A252073 A252074 A252075

Keyword

nonn

Author

R. H. Hardin, Dec 13 2014

Status

approved