96768

Appears in sequences

• Number of invertible 2 X 2 matrices mod n.at n=20A000252
• Glaisher's function U(n).at n=27A002612
• Values of phi(k) when phi(k) = phi(k+1).at n=42A003275
• Generalized Euler phi function (for p=2).at n=17A003473
• Theta series of {D_9}^{+} packing.at n=49A008436
• Expansion of cos(x*log(1+x)).at n=9A009031
• Triangle of coefficients in expansion of (1+12x)^n.at n=39A013619
• Theta series of 16-dimensional 2-modular lattice with min norm 3 and det 256 (the "odd Barnes-Wall lattice").at n=7A014711
• Theta series of shadow of lattice described in A014711.at n=7A014713
• Triangle whose (i,j)-th entry is binomial(i,j)*2^(i-j)*12^j (with i, j >= 0).at n=30A038218
• Triangle whose (i,j)-th entry is binomial(i,j)*12^(i-j)*2^j.at n=33A038328
• Gaps of 8 in sequence A038593 (lower terms).at n=32A038655
• Expansion of e.g.f. x^4*exp(x)^2.at n=9A052796
• a(n) is the sum of the divisors of the n-th primorial: a(n) = A000203(A002110(n)).at n=6A054640
• 13-almost primes (generalization of semiprimes).at n=24A069274
• Commuting elements: number of ordered pairs g, h in the group GL(2,Z_n) such that gh = hg.at n=6A070943
• Related to tennis ball problem.at n=3A079519
• a(n) = least integer of the form (n+2)(n+4)...(n+2k)/n, or 0 if no such number exists.at n=9A109899
• Numerator of f(n) := Product_{i=1..n} sigma(i)/i.at n=14A111928
• Triangle read by rows, obtained by multiplying columns of triangle in A094587 by 1,2,4,8,16,... respectively.at n=50A126064