a(n) = sqrt( Product_{j=1..n} Product_{k=1..2} (4*sin((2*j-1)*Pi/(2*n))^2 + 4*sin((2*k-1)*Pi/2)^2) ).
A341543
a(n) = sqrt( Product_{j=1..n} Product_{k=1..2} (4*sin((2*j-1)*Pi/(2*n))^2 + 4*sin((2*k-1)*Pi/2)^2) ).
Terms
- a(0) =8a(1) =36a(2) =200a(3) =1156a(4) =6728a(5) =39204a(6) =228488a(7) =1331716a(8) =7761800a(9) =45239076a(10) =263672648a(11) =1536796804a(12) =8957108168a(13) =52205852196a(14) =304278005000
External references
- oeis: A341543