Number of nX3 0..1 arrays with every element unequal to 0, 1 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A317768

Number of nX3 0..1 arrays with every element unequal to 0, 1 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =3a(1) =4a(2) =5a(3) =11a(4) =16a(5) =28a(6) =44a(7) =74a(8) =122a(9) =209a(10) =344a(11) =584a(12) =981a(13) =1670a(14) =2806a(15) =4758a(16) =8047a(17) =13665a(18) =23111a(19) =39195a(20) =66419a(21) =112700a(22) =190989a(23) =323943a(24) =549302a(25) =931821a(26) =1580102a(27) =2680148a(28) =4545629a(29) =7710521

External references