T(n,k)=Number of zero-sum nXk -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors.
A201803
T(n,k)=Number of zero-sum nXk -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =5a(2) =5a(3) =19a(4) =85a(5) =19a(6) =85a(7) =455a(8) =455a(9) =85a(10) =381a(11) =3617a(12) =4057a(13) =3617a(14) =381a(15) =1751a(16) =28625a(17) =48335a(18) =48335a(19) =28625a(20) =1751a(21) =8135a(22) =235827a(23) =562961a(24) =988589a(25) =562961a(26) =235827a(27) =8135a(28) =38165a(29) =1972115
External references
- oeis: A201803