Number of (n+2) X (4+2) 0..3 arrays with every 3 X 3 subblock row and column sum not 2 3 6 or 7 and every diagonal and antidiagonal sum 2 3 6 or 7.
A251890
Number of (n+2) X (4+2) 0..3 arrays with every 3 X 3 subblock row and column sum not 2 3 6 or 7 and every diagonal and antidiagonal sum 2 3 6 or 7.
Terms
- a(0) =1280a(1) =530a(2) =778a(3) =1316a(4) =1958a(5) =2660a(6) =4490a(7) =7250a(8) =10634a(9) =17954a(10) =28994a(11) =42530a(12) =71810a(13) =115970a(14) =170114a(15) =287234a(16) =463874a(17) =680450a(18) =1148930a(19) =1855490a(20) =2721794a(21) =4595714a(22) =7421954a(23) =10887170a(24) =18382850a(25) =29687810a(26) =43548674a(27) =73531394a(28) =118751234
External references
- oeis: A251890