a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026626.
A026964
a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026626.
Terms
- a(0) =1a(1) =12a(2) =77a(3) =434a(4) =1978a(5) =8830a(6) =37409a(7) =156474a(8) =644305a(9) =2632506a(10) =10684360a(11) =43166246a(12) =173768764a(13) =697596990a(14) =2794438513a(15) =11174809302a(16) =44626341136a(17) =178018744896a(18) =709505830530
External references
- oeis: A026964