Number of nX7 0..1 arrays with every element unequal to 0, 1 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A317772

Number of nX7 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) =21a(1) =30a(2) =44a(3) =32a(4) =42a(5) =54a(6) =75a(7) =107a(8) =149a(9) =221a(10) =317a(11) =491a(12) =739a(13) =1157a(14) =1774a(15) =2819a(16) =4306a(17) =6792a(18) =10478a(19) =16717a(20) =25903a(21) =41123a(22) =63905a(23) =101339a(24) =158206a(25) =252088a(26) =395573a(27) =629930a(28) =993422a(29) =1586551

External references