a(n) = Sum_{k=0..2*n-1} T(n, k)*T(n, k+1), T given by A027960.
A027985
a(n) = Sum_{k=0..2*n-1} T(n, k)*T(n, k+1), T given by A027960.
Terms
- a(0) =6a(1) =35a(2) =144a(3) =564a(4) =2186a(5) =8468a(6) =32856a(7) =127729a(8) =497454a(9) =1940525a(10) =7580656a(11) =29651385a(12) =116111194a(13) =455138499a(14) =1785707924a(15) =7011933544a(16) =27554583254a(17) =108355491404a(18) =426368213364
External references
- oeis: A027985