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

A255020

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

Terms

    a(0) =26a(1) =54a(2) =117a(3) =269a(4) =601a(5) =1306a(6) =2853a(7) =6308a(8) =13940a(9) =30665a(10) =67427a(11) =148503a(12) =327196a(13) =720513a(14) =1586270a(15) =3492908a(16) =7692097a(17) =16938749a(18) =37298997a(19) =82133026a(20) =180861833a(21) =398268024a(22) =877002280a(23) =1931193369a(24) =4252574871a(25) =9364367191a(26) =20620752180a(27) =45407795437

External references