Number of 3Xn 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1s.

A297225

Number of 3Xn 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1s.

Terms

    a(0) =1a(1) =9a(2) =24a(3) =57a(4) =182a(5) =535a(6) =1513a(7) =4415a(8) =12832a(9) =37110a(10) =107661a(11) =312229a(12) =904915a(13) =2623749a(14) =7607302a(15) =22054261a(16) =63940404a(17) =185379485a(18) =537454173a(19) =1558199157a(20) =4517574360a(21) =13097454856a(22) =37972451701a(23) =110090662857a(24) =319177485549a(25) =925367027389

External references