Number of nX7 0..1 arrays with every element unequal to 0, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A317814
Number of nX7 0..1 arrays with every element unequal to 0, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =1a(1) =23a(2) =9a(3) =77a(4) =230a(5) =434a(6) =1575a(7) =4232a(8) =10738a(9) =32307a(10) =97258a(11) =284543a(12) =844473a(13) =2492174a(14) =7314947a(15) =21633856a(16) =64114105a(17) =190269195a(18) =565469964a(19) =1680638925a(20) =4997924210a(21) =14880430677a(22) =44338998293a(23) =132229102288a(24) =394662334943
External references
- oeis: A317814