a(n) is the number of integer strings s(0),...,s(n) counted by array T in A026386 that have s(n)=2; also a(n) = T(2n,n-1).
A026388
a(n) is the number of integer strings s(0),...,s(n) counted by array T in A026386 that have s(n)=2; also a(n) = T(2n,n-1).
Terms
- a(0) =1a(1) =5a(2) =24a(3) =114a(4) =541a(5) =2573a(6) =12275a(7) =58747a(8) =282003a(9) =1357407a(10) =6549906a(11) =31675020a(12) =153481299a(13) =745011075a(14) =3622111560a(15) =17635418730a(16) =85975792075a(17) =419644943495
External references
- oeis: A026388