276480

Appears in sequences

• Number of primitive polynomials of degree n over GF(2) (version 2).at n=23A000020
• Generalized tangent numbers d_(n,2).at n=35A000176
• Theta series of packing P_{10c}.at n=12A004021
• Ratios of successive terms are 1,2,2,2,3,4,4,4,5,6,6,6,7,...at n=11A004528
• Theta series of (probably nonexistent) exceptionally good 16-dimensional sphere packing.at n=5A008774
• Number of primitive polynomials of degree n over GF(2).at n=23A011260
• Theta series of shadow of lattice described in A014711.at n=8A014713
• a(n) = phi(4^n-1)/(2*n).at n=11A027742
• Triangle whose (i,j)-th entry is binomial(i,j)*2^(i-j)*12^j (with i, j >= 0).at n=24A038218
• Triangle read by rows: (i,j)-th entry is binomial(i,j)*3^(i-j)*8^j.at n=24A038226
• Triangle whose (i,j)-th entry is binomial(i,j)*4^(i-j)*6^j.at n=24A038236
• Triangle whose (i,j)-th entry is binomial(i,j)*4^(i-j)*12^j.at n=18A038242
• Triangle whose (i,j)-th entry is binomial(i,j)*6^(i-j)*4^j.at n=24A038258
• Triangle whose (i,j)-th entry is binomial(i,j)*8^(i-j)*3^j.at n=24A038281
• Triangle whose (i,j)-th entry is binomial(i,j)*12^(i-j)*2^j.at n=24A038328
• Triangle whose (i,j)-th entry is binomial(i,j)*12^(i-j)*4^j.at n=17A038330
• A convolution triangle of numbers generalizing Pascal's triangle A007318.at n=58A049325
• Sum of divisors of those numbers n such that n and n+1 have the same sum of divisors.at n=32A053215
• Sum of divisors of k such that k and k+1 have the same number and sum of divisors.at n=10A054005
• Iteration of unitary-sigma function: a(1) = 2, a(n) = usigma(a(n-1)).at n=29A059460