Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum unequal to 4 or 5 and every diagonal and antidiagonal sum equal to 4 or 5.
A251898
Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum unequal to 4 or 5 and every diagonal and antidiagonal sum equal to 4 or 5.
Terms
- a(0) =1652a(1) =2596a(2) =3312a(3) =5264a(4) =9208a(5) =16532a(6) =23868a(7) =39884a(8) =71752a(9) =133166a(10) =215372a(11) =385436a(12) =645120a(13) =1175522a(14) =1992664a(15) =3630592a(16) =6053132a(17) =11027640a(18) =18589076a(19) =33876216a(20) =57036688a(21) =104047908a(22) =174874732a(23) =318791492a(24) =537411108a(25) =979946108a(26) =1650420932
External references
- oeis: A251898