Number of n X 3 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 or 4 neighboring 1s.

A296536

Number of n X 3 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 or 4 neighboring 1s.

Terms

    a(0) =1a(1) =5a(2) =16a(3) =37a(4) =96a(5) =254a(6) =654a(7) =1709a(8) =4472a(9) =11621a(10) =30257a(11) =78899a(12) =205534a(13) =535394a(14) =1395017a(15) =3634476a(16) =9468722a(17) =24669483a(18) =64272370a(19) =167449745a(20) =436262198a(21) =1136608103a(22) =2961236309a(23) =7714995835a(24) =20100110050a(25) =52367403411a(26) =136434332477a(27) =355456392933

External references