Number of n X 3 0..1 arrays with each 1 adjacent to 2 or 4 king-move neighboring 1s.

A296034

Number of n X 3 0..1 arrays with each 1 adjacent to 2 or 4 king-move neighboring 1s.

Terms

    a(0) =1a(1) =11a(2) =31a(3) =70a(4) =251a(5) =799a(6) =2266a(7) =7005a(8) =21780a(9) =65489a(10) =199273a(11) =610585a(12) =1857468a(13) =5653794a(14) =17249124a(15) =52563162a(16) =160123076a(17) =488054813a(18) =1487412562a(19) =4532419434a(20) =13812563405a(21) =42094180094a(22) =128277984857a(23) =390920465658

External references