Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8.
A252048
Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8.
Terms
- a(0) =2812a(1) =2552a(2) =2674a(3) =4390a(4) =10114a(5) =17166a(6) =26840a(7) =60924a(8) =113000a(9) =193072a(10) =421192a(11) =784028a(12) =1394282a(13) =3087474a(14) =5777716a(15) =10357952a(16) =23108068a(17) =43785546a(18) =79036304a(19) =176309004a(20) =336109562a(21) =611054654a(22) =1364292594a(23) =2606484074a(24) =4759349604a(25) =10644268052
External references
- oeis: A252048