38528

Appears in sequences

• Number of ways of writing n as a sum of 8 squares.at n=14A000143
• Generalized Euler numbers c(3,n).at n=3A000436
• Generalized class numbers c_(n,3).at n=2A000508
• Expansion of e.g.f. (sin x + cos x)/cos 3x.at n=6A000810
• Expansion of e.g.f. (sin(2*x) + cos(x)) / cos(3*x).at n=6A007289
• Theta series of D_8 lattice.at n=7A008430
• Fourier coefficients of E_{0,4}.at n=14A035016
• Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A057505/A057506.at n=15A057507
• Number of cycles in range [A014137(2n)..A014138(2n)] of permutation A057505/A057506.at n=7A081167
• Numbers that appear exactly five times in A101402. (Also indices of fives in A101403.).at n=26A129117
• A bisection of A000436.at n=1A156178
• The first of three triangles counting 3-colored alternating permutations by their last value.at n=27A202692
• Number of (w,x,y,z) with all terms in {1,...,n} and |w-x|<|x-y|+|y-z|.at n=15A212571
• Shanks's array c_{a,n} (a >= 1, n >= 0) that generalizes Euler and class numbers, read by antidiagonals upwards.at n=18A235605
• Numbers k such that k = rad(k) * sopfr(k), where rad(k) is the squarefree kernel of k and sopfr(k) the integer log of k.at n=18A280935
• Row sums of A296664.at n=14A296663
• Row sums of A296666.at n=7A296665
• Array A(n, k) that generalizes Euler numbers, class numbers, and tangent numbers, read by ascending antidiagonals.at n=42A349271
• a(n) is the number of elements z of Z_p[i] such that #{z^k, k >= 0} = p^2-1 (where p denotes A002145(n), the n-th prime number congruent to 3 modulo 4).at n=35A374001