3758096382domain: NAppears in sequencesa(n) = Sum_{k=0..n} A026615(n, k).at n=31A026622a(3) = 1, otherwise a(n) = n*2^(n-3) - 2^(n-2) - 2.at n=27A058966a(0)=1, a(1)=2, a(2)=1; for n>2, a(n) = 7*2^(n-3)-2.at n=32A174317a(n) = 7*2^n - 2.at n=29A176448