Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,1,0,0,0 for x=0,1,2,3,4.
A197470
Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,1,0,0,0 for x=0,1,2,3,4.
Terms
- a(0) =3a(1) =6a(2) =26a(3) =46a(4) =181a(5) =374a(6) =1300a(7) =2886a(8) =9446a(9) =22060a(10) =69096a(11) =167466a(12) =507600a(13) =1265434a(14) =3741192a(15) =9529514a(16) =27644128a(17) =71580304a(18) =204668940a(19) =536641128a(20) =1517618972a(21) =4017418484a(22) =11266355518a(23) =30042504088a(24) =83713614532a(25) =224474050480
External references
- oeis: A197470