a(n) = Sum_{k=0..n} U_k((n-k)/2) where U_n(x) is a Chebyshev polynomial of the 2nd kind.
A341576
a(n) = Sum_{k=0..n} U_k((n-k)/2) where U_n(x) is a Chebyshev polynomial of the 2nd kind.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =7a(5) =16a(6) =46a(7) =149a(8) =520a(9) =1977a(10) =8136a(11) =35878a(12) =168501a(13) =838945a(14) =4409957a(15) =24385913a(16) =141412615a(17) =857611640a(18) =5426144190a(19) =35739397739a(20) =244573978100
External references
- oeis: A341576