1400832

Appears in sequences

• a(1) = 1, a(2) = (2*1)/1 = 2. a(n+1) = (n+1)*a(n) divided by the largest prime divisor of a(n).at n=18A100773
• a(1)=1, a(2)=1, a(3)=4, a(4)=0; a(n)=12a(n-2)-16a(n-3) for n>=5.at n=12A123016
• a(n) = 2^(n-2)*(n-2)^2+2^(n-1).at n=13A217527
• (1/4) times the sum of the elements of all subsets of [n] whose sum is divisible by four.at n=18A309296