Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not 2 4 5 or 7 and every diagonal and antidiagonal sum 2 4 5 or 7.
A251870
Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not 2 4 5 or 7 and every diagonal and antidiagonal sum 2 4 5 or 7.
Terms
- a(0) =2146a(1) =5632a(2) =7160a(3) =15116a(4) =36852a(5) =41816a(6) =99808a(7) =169196a(8) =246152a(9) =568040a(10) =969972a(11) =1827696a(12) =3266080a(13) =5533228a(14) =11336584a(15) =20569704a(16) =40514260a(17) =75022128a(18) =125003744a(19) =253497484a(20) =485341704a(21) =914789992a(22) =1783429620a(23) =3100407280a(24) =5803394208
External references
- oeis: A251870