Number of nX4 0..1 arrays with every element unequal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A317737

Number of nX4 0..1 arrays with every element unequal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =0a(1) =2a(2) =3a(3) =4a(4) =14a(5) =23a(6) =35a(7) =98a(8) =213a(9) =448a(10) =1053a(11) =2285a(12) =5170a(13) =11442a(14) =25631a(15) =57472a(16) =127875a(17) =286908a(18) =640173a(19) =1432260a(20) =3202305a(21) =7156889a(22) =16008863a(23) =35779725a(24) =80013078a(25) =178882627a(26) =399942789a(27) =894243714a(28) =1999266125a(29) =4470164997

External references