a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026386.
A026954
a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026386.
Terms
- a(0) =1a(1) =10a(2) =83a(3) =452a(4) =3171a(5) =14700a(6) =97482a(7) =422544a(8) =2730615a(9) =11442786a(10) =72932904a(11) =299882916a(12) =1895949055a(13) =7706754370a(14) =48478715240a(15) =195623710160
External references
- oeis: A026954