Number of (n+2)X(1+2) 0..3 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 2 3 6 or 7.
A251784
Number of (n+2)X(1+2) 0..3 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 2 3 6 or 7.
Terms
- a(0) =1280a(1) =1664a(2) =3072a(3) =6144a(4) =11834a(5) =22632a(6) =44792a(7) =86988a(8) =170432a(9) =342826a(10) =673546a(11) =1333808a(12) =2714614a(13) =5407074a(14) =10855306a(15) =22352610a(16) =45191680a(17) =92075992a(18) =191833122a(19) =393688208a(20) =813894868a(21) =1714886756a(22) =3570500704a(23) =7482636226a(24) =15926322646
External references
- oeis: A251784