Consider the figure made up of a row of n adjacent congruent rectangles, with diagonals of all possible rectangles drawn; a(n) = number of interior vertices where exactly five lines cross.
A336491
Consider the figure made up of a row of n adjacent congruent rectangles, with diagonals of all possible rectangles drawn; a(n) = number of interior vertices where exactly five lines cross.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =2a(6) =2a(7) =12a(8) =26a(9) =20a(10) =10a(11) =38a(12) =74a(13) =118a(14) =102a(15) =114a(16) =126a(17) =178a(18) =238a(19) =306a(20) =382a(21) =466a(22) =558a(23) =762a(24) =774a(25) =778a(26) =774a(27) =942a(28) =1126a(29) =1326
External references
- oeis: A336491