39870

Appears in sequences

• a(n) = self-convolution of row n of array T given by A027960.at n=8A027978
• Start with x, y; then concatenate each word in turn with all preceding words, getting x y xy xxy yxy xxxy yxxy xyxxy ...; sequence gives number of words of length n. Also binary trees by degree: x y (x,y) (x,(x,y)) (y,(x,y)) (x,(x,(x,y))) (y,(x,(x,y))) ((x,y),(x,(x,y)))...at n=12A063894
• a(n) is the difference between A084321(n) and the (n-1)th power of 2.at n=31A085355
• Convolution of sum of cubes of divisors with itself.at n=8A087115
• Number of strings of numbers x(i=1..7) in 0..n with sum i*x(i)^2 equal to n*49.at n=11A184446
• Partial sums of A033617.at n=43A299903
• Expansion of (-1 + Product_{k>=1} 1 / (1 + (-x)^k))^5.at n=24A341244