a(n) = T(3n,n), where T is the array in A026120.
A026129
a(n) = T(3n,n), where T is the array in A026120.
Terms
- a(0) =1a(1) =2a(2) =16a(3) =120a(4) =945a(5) =7630a(6) =62678a(7) =521264a(8) =4375359a(9) =36990200a(10) =314520602a(11) =2686858784a(12) =23042640803a(13) =198266292798
External references
- oeis: A026129