30978

Appears in sequences

• s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = A000201 (lower Wythoff sequence), t = A001950 (upper Wythoff sequence).at n=43A024686
• s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = A000201 (lower Wythoff sequence), t = A001950 (upper Wythoff sequence).at n=42A025119
• a(n) = (9*n^4 + 4*n^3 - n)/2.at n=9A047786
• Sums of two or more distinct 4th powers of primes.at n=34A130833
• Arises in enumerating Huffman codes, compact trees, and sums of unit fractions.at n=17A194629
• Numbers of the form k^2 + 2 that are the sums of two squares.at n=16A329170
• Expansion of 1 / ( (1-3*x) * (1-6*x) )^(2/3).at n=6A383937