193419915domain: NAppears in sequencesa(n) is the number of integer strings s(0),...,s(n) counted by array T in A026374 that have s(n)=2; also a(n) = T(2n,n-1).at n=12A026376a(n) equals the coefficient of x^n in Sum_{m>=0} (x^m + 3 + 1/x^m)^m for n >= 1.at n=12A316593