Number of (n+1) X (n+1) 0..3 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4 (constant-stress 1 X 1 tilings).
A235281
Number of (n+1) X (n+1) 0..3 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4 (constant-stress 1 X 1 tilings).
Terms
- a(0) =20a(1) =68a(2) =148a(3) =380a(4) =740a(5) =1724a(6) =3220a(7) =7196a(8) =13220a(9) =28988a(10) =52948a(11) =115100a(12) =210020a(13) =454844a(14) =830740a(15) =1796636a(16) =3286820
External references
- oeis: A235281