71706

Appears in sequences

• a(n) = number of (s(0), s(1), ..., s(2*n-1)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| = 1 for i = 1,2,...,n, s(0) = 3, s(2*n-1) = 6. Also a(n) = T(2*n-1,n-2), where T is defined in A026022.at n=8A026027
• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,45.at n=25A064259
• a(n) = (1)*(2 + 3 + 4 + ... + n) + (1 + 2)*(3 + 4 + 5 + ... + n) + (1 + 2 + 3)*(4 + 5 + 6 + ... + n) + ... + (1 + 2 + 3 + ... + n-1)*n.at n=17A067056
• Sums of the products of n consecutive pairs of numbers.at n=37A135036
• Numbers k such that k - 13, k + 1, k + 5, k + 7, and k + 13 are all prime.at n=12A281937
• Number of graph minors in the n-pan graph.at n=25A353603
• Number of weak compositions of n such that the set of adjacent differences is a subset of {-1,1}.at n=25A383620
• a(n) = (1/(n+1)) * Sum_{k=0..n} k^2 * (k+1) * binomial(2*n-k,n-k).at n=9A390965