Number of nX4 0..1 arrays with every element equal to 0, 1, 3, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A300940
Number of nX4 0..1 arrays with every element equal to 0, 1, 3, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =5a(1) =3a(2) =12a(3) =38a(4) =75a(5) =186a(6) =530a(7) =1401a(8) =3811a(9) =10666a(10) =29764a(11) =85074a(12) =243478a(13) =700526a(14) =2028715a(15) =5890335a(16) =17145198a(17) =50000931a(18) =145968525a(19) =426553602a(20) =1247498091a(21) =3650210391a(22) =10684555961a(23) =31283438794a(24) =91612270064a(25) =268323435201a(26) =785979716062
External references
- oeis: A300940