66419

Appears in sequences

• Total sum of odd parts in the last section of the set of partitions of n.at n=35A206435
• Expansion of 1/(1 - x - x^2 + x^6 - x^8).at n=25A225393
• Expansion of Product_{k>=1} (1 + x^k)^k / (1 + x^(4*k))^(4*k).at n=26A285292
• Number of nX3 0..1 arrays with every element unequal to 0, 1 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=20A317768
• a(1) = 1 and thereafter a(n) = a(n-1) + j(n-1) where j(1) = 1 and then j(n) = j(n-1)-1 if a(n) is composite or j(n) = 2*j(n-1) if a(n) is prime.at n=49A382671