Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,2,1,1,1 for x=0,1,2,3,4.
A197541
Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,2,1,1,1 for x=0,1,2,3,4.
Terms
- a(0) =3a(1) =19a(2) =24a(3) =131a(4) =206a(5) =834a(6) =2081a(7) =6653a(8) =15931a(9) =48796a(10) =135249a(11) =391078a(12) =1061878a(13) =3054971a(14) =8582689a(15) =24243393a(16) =67728862a(17) =192162581a(18) =541573358a(19) =1525969004a(20) =4291400929a(21) =12116692925a(22) =34147187837a(23) =96210697228a(24) =271054147869a(25) =764411232314
External references
- oeis: A197541