20480

Appears in sequences

• Expansion of (1+x)/(1-4*x).at n=7A003947
• Numbers that are the sum of 10 positive 11th powers.at n=10A004821
• Expansion of e.g.f. cos(x)*cos(tan(x)), even powers only.at n=5A009099
• a(n) = Product_{i=0..6} floor((n+i)/7).at n=29A009641
• Triangle of coefficients in expansion of (1+8x)^n.at n=19A013615
• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite EUO = EU-1 Nan[AlnSi112-nO224] starting with a T10 atom.at n=13A019129
• a(n) = 5 * 2^n.at n=12A020714
• a(n) = 12^n - n^4.at n=4A024144
• Numbers of form 2^i*10^j, with i, j >= 0.at n=41A025612
• Numbers of form 4^i*5^j, with i, j >= 0.at n=29A025617
• Numbers of form 5^i*8^j, with i, j >= 0.at n=20A025623
• Expansion of (theta_3(z)*theta_3(2z)*theta_3(4z)+theta_2(z)*theta_2(2z)*theta_2(4z))^4.at n=33A028701
• Expansion of (1 + 2x + 6x^2 + x^3)/(1 - 2x^2).at n=27A029745
• Numbers of the form 2^k times 1, 3 or 5.at n=40A029747
• Numbers of the form 2^k times 1, 5 or 7.at n=39A029749
• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 71.at n=34A031569
• Numbers whose prime factors are 2 and 5.at n=34A033846
• Numbers k such that the decimal part of k^(1/7) starts with a 'nine digits' anagram.at n=8A034282
• Triangle read by rows: T(n,k) (n >= 2, 0 <= k <= n) = number of over-all crude totals of unbranched k-5-catapolyheptagons.at n=34A038195
• Triangle whose (i,j)-th entry is binomial(i,j)*2^(i-j)*8^j.at n=18A038214