25626

Appears in sequences

• Number of polyhedra with n nodes and n faces.at n=7A002856
• Number of ordered 5-tuples of integers from [ 1,n ] with no common factors among quadruples.at n=18A015653
• Triangle T(n,k) = number of polyhedra (triconnected planar graphs) with n faces and k vertices, where (n/2+2) <= k <= (2n+8).at n=40A058787
• Triangle T(n,k) = number of polyhedra (triconnected planar graphs) with n edges and k vertices (or k faces), where (n/3+2) <= k <= (2n/3). Note that there is no such k when n=7.at n=37A058788
• 53 'Reverse and Add' steps are needed to reach a palindrome.at n=13A065320
• Even pseudoprimes to base 37.at n=21A130441
• Row sums of triangle A131819.at n=41A131820
• Irregular triangle read by rows: T(n,k) is the number of polyhedra with n faces and k vertices (n >= 4, k=4..2n-4).at n=56A212438
• p-INVERT of (0,1,0,1,0,1,...), where p(S) = (1 - S)^6.at n=9A291226
• Number of nX4 0..1 arrays with every element equal to 1, 2 or 4 king-move adjacent elements, with upper left element zero.at n=15A297854
• Number of compositions (ordered partitions) of n into parts > 1 such that no two adjacent parts are equal (Carlitz compositions).at n=27A298732
• a(n) = Sum_{k=1..n-1} tau(k) * sigma_2(n-k).at n=28A374973