357903019

Appears in sequences

• a(n) = Sum_{k=floor((n+1)/2)..n} J(k+1), J(k) = A001045(k).at n=28A129362
• a(n) = (1^n + (-2)^n + 4^n)/3.at n=15A245489
• a(n) = (q^2-q+1)/3 where q = 2^(2*n+1) = A004171(n).at n=7A345963