20482

Appears in sequences

• Numbers that are the sum of 12 positive 11th powers.at n=10A004823
• a(n) = ceiling((1 + sum of preceding terms) / 2) starting with a(0) = 1.at n=25A005428
• Arkons: number of elementary maps with n-1 nodes.at n=11A006343
• a(0) = 1, a(n) = 20*n^2 + 2 for n>0.at n=32A010010
• a(n) = (n-1)*2^n + 2.at n=11A048495
• a(n) = ceiling((Sum_{k=1..n-1} a(k)) / 2) for n >= 2 starting with a(1) = 1.at n=26A073941
• Subsequence of A005428 with state = 1.at n=12A081614
• a(1) = 1; for n > 1: if n is even, a(n) = least k > 0 such that sum(i=1,n/2,a(2*i-1))/sum(j=1,n,a(j))>=1/4, or 1 if there is no such k; if n is odd, a(n) = largest k > 0 such that sum(i=1,(n+1)/2,a(2*i-1))/sum(j=1,n,a(j))<=1/3, or 1 if there is no such k.at n=54A104740
• Number of ways to place 3 nonattacking wazirs on a 3 X n board.at n=17A172229
• Number of line segments connecting exactly 8 points in an n x n grid of points.at n=41A177724
• Number of kites, distinct up to congruence, on an n X n grid (or geoboard).at n=38A181946
• Number of strings of numbers x(i=1..7) in 0..n with sum i^3*x(i)^2 equal to 343*n^2.at n=22A184308
• a(n) = 7*n*(2*n + 1).at n=38A195026
• a(n) = smallest k having at least three prime divisors d such that (d + n) | (k + n).at n=37A202158
• Numbers n such that Sum_{i = 1..q} 1/d(i) is an integer where d(i) are the divisors of n for some q and n is primitive (the set {d(1), d(2), ..., d(q)} appears only once).at n=10A226853
• Numbers k such that k!6 + 27 is prime, where k!6 is the sextuple factorial number (A085158 ).at n=25A288447
• Expansion of Product_{k>=1} 1/(1 + prime(k)*x^k).at n=14A305881
• a(n) is that generation of the rule-30 1D cellular automaton started from a single ON cell in which n successive OFF cells appears for the first time after a(n-1).at n=31A319606
• Sum of all the parts in the partitions of n into 10 squarefree parts.at n=38A326627
• Subsequence of A071395. The extra constraint is m is not a term if m*q/p is abundant where prime p|m and q is the least prime larger than p.at n=7A333967