Number of nX1 0..2 arrays with exactly floor(nX1/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order.
A222884
Number of nX1 0..2 arrays with exactly floor(nX1/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =6a(4) =16a(5) =16a(6) =40a(7) =280a(8) =768a(9) =1440a(10) =3808a(11) =16352a(12) =45056a(13) =111104a(14) =300672a(15) =1072512a(16) =2959360a(17) =8281600a(18) =22668800a(19) =74866176a(20) =206880768a(21) =614068224a(22) =1691502592a(23) =5409544192a(24) =14973206528a(25) =45696688128a(26) =126360084480a(27) =398896128000
External references
- oeis: A222884