Number of nX4 0..1 arrays with every element unequal to 0, 1, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A318346

Number of nX4 0..1 arrays with every element unequal to 0, 1, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =5a(1) =7a(2) =13a(3) =14a(4) =29a(5) =55a(6) =106a(7) =220a(8) =432a(9) =885a(10) =1788a(11) =3642a(12) =7416a(13) =15082a(14) =30713a(15) =62570a(16) =127441a(17) =259671a(18) =529160a(19) =1078183a(20) =2197318a(21) =4477498a(22) =9124533a(23) =18594318a(24) =37892248a(25) =77219600a(26) =157363288a(27) =320686910a(28) =653519695a(29) =1331791431

External references