18834

Appears in sequences

• Number of multigraphs with 4 nodes and n edges.at n=32A003082
• a(n) = Sum_{i=1..floor((n+1)/4)} a(2*i-1) * a(n-2*i+1), with a(1)=a(2)=1.at n=25A024722
• Numbers k that, when expressed in base 6 and then interpreted in base 8, give a multiple of k.at n=21A062937
• Floor(X/Y) where X = concatenation of the (n+1)-st even number through the (2n)-th even number and Y = concatenation of first n even numbers.at n=21A067091
• Group the composite numbers so that the sum of the n-th group is a multiple of the n-th prime: (4), (6), (8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22), (24, 25), (26, 27, 28, 30, 32), (33, 34, ...), ... Sequence gives sum of n-th group.at n=13A074124
• Coefficients in the expansion of C^2/B^3, in Watson's notation of page 106.at n=14A160462
• Number of 0..7 arrays x(0..n+1) of n+2 elements with zero n-1st differences.at n=16A200271
• Number of length 4 0..n arrays with each partial sum starting from the beginning no more than two standard deviations from its mean.at n=10A244835
• a(n) = prime(n)^3 - prime(n^3).at n=10A262199
• Numbers n such that n^1024 + (n+1)^1024 is prime.at n=32A274234
• a(n) = Sum_{k=0..floor(n/3)} binomial(n-2*k,k) * binomial(2*(n-2*k),n-2*k).at n=8A360266
• Expansion of 1/(1 - 4 * Sum_{k>=0} x^(3^k))^(1/2).at n=8A382189