Number of nX2 0..2 arrays with exactly floor(nX2/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order.
A222667
Number of nX2 0..2 arrays with exactly floor(nX2/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order.
Terms
- a(0) =0a(1) =0a(2) =2a(3) =9a(4) =24a(5) =80a(6) =288a(7) =1038a(8) =3608a(9) =12696a(10) =45024a(11) =160364a(12) =571200a(13) =2039424a(14) =7297632a(15) =26163672a(16) =93938304a(17) =337754400a(18) =1215965472a(19) =4382841504a(20) =15814326912a(21) =57117508992a(22) =206479723776a(23) =747042295968
External references
- oeis: A222667