Number of nX4 0..1 arrays with no occurrence of three equal elements in a row horizontally, vertically or nw-to-se diagonally, and new values 0..1 introduced in row major order.
A204193
Number of nX4 0..1 arrays with no occurrence of three equal elements in a row horizontally, vertically or nw-to-se diagonally, and new values 0..1 introduced in row major order.
Terms
- a(0) =5a(1) =50a(2) =86a(3) =265a(4) =883a(5) =2974a(6) =9940a(7) =33462a(8) =112470a(9) =377908a(10) =1270638a(11) =4271547a(12) =14358358a(13) =48270403a(14) =162269445a(15) =545492694a(16) =1833790077a(17) =6164622703a(18) =20723502506a(19) =69666040146a(20) =234195417025a(21) =787291729779
External references
- oeis: A204193