Number of 2Xn 0..3 arrays with exactly floor(2Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
A222501
Number of 2Xn 0..3 arrays with exactly floor(2Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
Terms
- a(0) =0a(1) =0a(2) =4a(3) =5a(4) =14a(5) =122a(6) =196a(7) =1861a(8) =4042a(9) =32952a(10) =75324a(11) =618635a(12) =1437882a(13) =11665906a(14) =28055204a(15) =220984129a(16) =550922114a(17) =4208027596a(18) =10854564024a(19) =80459791286a(20) =214468168532
External references
- oeis: A222501