Number of (n+2) X (1+2) 0..1 arrays with no 3 x 3 subblock diagonal sum equal to the antidiagonal sum or central row sum equal to the central column sum.
A258918
Number of (n+2) X (1+2) 0..1 arrays with no 3 x 3 subblock diagonal sum equal to the antidiagonal sum or central row sum equal to the central column sum.
Terms
- a(0) =200a(1) =576a(2) =1680a(3) =5184a(4) =15840a(5) =46656a(6) =138240a(7) =419904a(8) =1270080a(9) =3779136a(10) =11275200a(11) =34012224a(12) =102409920a(13) =306110016a(14) =916090560a(15) =2754990144a(16) =8278407360a(17) =24794911296a(18) =74304112320a(19) =223154201664a(20) =669946334400
External references
- oeis: A258918