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

A317760

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

Terms

    a(0) =8a(1) =20a(2) =28a(3) =43a(4) =72a(5) =127a(6) =232a(7) =432a(8) =813a(9) =1539a(10) =2922a(11) =5557a(12) =10577a(13) =20141a(14) =38362a(15) =73076a(16) =139212a(17) =265212a(18) =505263a(19) =962600a(20) =1833903a(21) =3493880a(22) =6656412a(23) =12681561a(24) =24160471a(25) =46029702a(26) =87694221a(27) =167072053a(28) =318300013a(29) =606414406

External references