Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,2,1,0,0 for x=0,1,2,3,4.
A198180
Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,2,1,0,0 for x=0,1,2,3,4.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =25a(4) =77a(5) =148a(6) =395a(7) =866a(8) =2346a(9) =5663a(10) =14065a(11) =34309a(12) =84252a(13) =208413a(14) =513352a(15) =1266410a(16) =3117377a(17) =7679699a(18) =18927327a(19) =46639092a(20) =114949605a(21) =283220762a(22) =697929906a(23) =1719783577a(24) =4237987789a(25) =10443340285a(26) =25734497336a(27) =63415169957a(28) =156267786924
External references
- oeis: A198180