Number of nX2 0..2 arrays with exactly floor(nX2/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order.
A222425
Number of nX2 0..2 arrays with exactly floor(nX2/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order.
Terms
- a(0) =0a(1) =0a(2) =4a(3) =13a(4) =36a(5) =132a(6) =584a(7) =2054a(8) =7700a(9) =29208a(10) =113024a(11) =428784a(12) =1637248a(13) =6322400a(14) =24241600a(15) =93878180a(16) =360819968a(17) =1402924464a(18) =5410402304a(19) =21069262688a(20) =81508818720a(21) =317854067456
External references
- oeis: A222425