217579

Properties

Appears in sequences

• a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = 2^(p+1) + 2 - n and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 2, and a(3) = 4.at n=19A049913
• The number of tilings of the 3 X 4 X n room by 1 X 1 X 3 boxes.at n=7A237355
• Prime numbersat n=19415