17501619domain: NAppears in sequencesa(n) = number of integer strings s(0),...,s(n) counted by array T in A026374 that have s(n)=1; also a(n) = T(2n-1,n-1).at n=11A026378a(n) = T(n,[ n/2 ]), where T is the array in A026374.at n=22A026380T(n,[ n/2 ]), where T is the array in A026386.at n=22A026392