20657

Appears in sequences

• Partial sums of A084570.at n=25A084569
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+967)^2 = y^2.at n=7A130017
• Triangle T, read by rows, where row n of T = row n-1 of T^fibonacci(n) with appended '1' for n>=1 starting with a single '1' in row 0.at n=30A136170
• Column 2 of triangle A136170.at n=4A136173
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, -1, 1), (-1, 1, -1), (1, -1, 1), (1, 1, 0)}.at n=9A149110
• Coefficients in a q-analog of the function [LambertW(-2x)/(-2x)]^(1/2), as a triangle read by rows.at n=29A152550
• a(n) = 3*n^4 + 12*n^3 + 30*n^2 + 36*n + 17.at n=8A160827
• The number of subsets X of Zn such that for all u, v in X, u+v is not in X.at n=25A206702
• 7-distance Pell sequence.at n=45A237716
• T(n,k)=Number of nXk 0..3 arrays with no element equal to one plus the sum of elements to its left or zero plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=39A240760
• a(n) is the number of partitions of n such that the number of parts having multiplicity > 1 is a part.at n=39A241408
• Numbers that are the sum of fourth powers of three distinct positive integers in arithmetic progression.at n=22A306214
• Square array T(n,k), n >= 1, k >= 0, read by antidiagonals downwards, where T(n,k) = Sum_{j=1..n} j^k * binomial(floor(n/j)+1,2).at n=59A356124
• a(n) = Sum_{k=1..n} k * sigma_n(k).at n=4A356128