a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026374.
A026948
a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026374.
Terms
- a(0) =1a(1) =8a(2) =58a(3) =272a(4) =1770a(5) =7428a(6) =46928a(7) =189808a(8) =1185645a(9) =4724160a(10) =29362806a(11) =116207424a(12) =720606705a(13) =2842936320a(14) =17610412600a(15) =69378730880a(16) =429579843435
External references
- oeis: A026948