Number of nX3 0..1 arrays with every element equal to 0, 2, 3 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

A302146

Number of nX3 0..1 arrays with every element equal to 0, 2, 3 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =10a(4) =28a(5) =84a(6) =260a(7) =816a(8) =2576a(9) =8152a(10) =25824a(11) =81840a(12) =259408a(13) =822304a(14) =2606720a(15) =8263456a(16) =26195776a(17) =83042752a(18) =263252544a(19) =834533120a(20) =2645541888a(21) =8386596224a(22) =26586234880a(23) =84280663296a(24) =267176990976a(25) =846974167552

External references