Number of 4 X n 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 2 neighboring 1s.

A297301

Number of 4 X n 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 2 neighboring 1s.

Terms

    a(0) =1a(1) =1a(2) =5a(3) =10a(4) =21a(5) =50a(6) =130a(7) =332a(8) =840a(9) =2128a(10) =5408a(11) =13772a(12) =35102a(13) =89465a(14) =227961a(15) =580788a(16) =1479748a(17) =3770356a(18) =9606981a(19) =24478804a(20) =62372090a(21) =158923930a(22) =404938148a(23) =1031783666a(24) =2628989168a(25) =6698674670a(26) =17068245866a(27) =43489945955a(28) =110812526805

External references