login
A252196
Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 5 6 or 7
1
970, 669, 1647, 5177, 17541, 60325, 206825, 711829, 2455121, 8451245, 29078203, 100127089, 344830251, 1187280753, 4087599057, 14073866459, 48459148779, 166851565227, 574482172271, 1977991833559, 6810453196743, 23449166058697
OFFSET
1,1
COMMENTS
Column 3 of A252201
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) -a(n-2) +13*a(n-3) +20*a(n-4) +23*a(n-5) +13*a(n-6) -57*a(n-7) -56*a(n-8) +10*a(n-10) +60*a(n-11) +29*a(n-12) -23*a(n-13) -28*a(n-14) -14*a(n-15) +6*a(n-16) +4*a(n-18) for n>23
EXAMPLE
Some solutions for n=4
..3..2..3..3..3....0..2..2..0..0....2..3..3..2..3....3..2..3..3..3
..2..3..3..3..3....0..1..0..1..0....3..3..3..3..3....3..3..3..2..3
..3..3..3..3..3....1..1..0..0..1....3..3..3..3..3....2..3..3..3..3
..3..2..3..3..3....0..0..1..0..1....2..3..3..3..3....3..3..3..3..2
..3..3..3..3..2....1..0..0..2..2....3..3..3..3..3....3..3..3..3..3
..3..3..2..3..3....0..1..1..2..1....3..2..3..3..2....2..3..3..3..3
CROSSREFS
Sequence in context: A107555 A175991 A030251 * A345538 A345790 A257975
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 15 2014
STATUS
approved