a(n) = Sum_{k=0..m} T(n,k) * T(n,k+2), where m=2 for n=2 and m=n+1 for n >= 3; and T is given by A026148.
A027331
a(n) = Sum_{k=0..m} T(n,k) * T(n,k+2), where m=2 for n=2 and m=n+1 for n >= 3; and T is given by A026148.
Terms
- a(0) =5a(1) =36a(2) =293a(3) =2374a(4) =19398a(5) =159072a(6) =1310669a(7) =10844525a(8) =90088935a(9) =751173656a(10) =6284938344a(11) =52752138077a(12) =444072874534
External references
- oeis: A027331