26130

Appears in sequences

• Number of words of length n (n >= 1) over a two-letter alphabet having a minimal period of size n-2.at n=16A019311
• a(n) is the concatenation of n and 5n.at n=25A019553
• a(n) = dot_product(1,2,...,n)*(7,8,...,n,1,2,3,4,5,6).at n=38A026049
• q-factorial numbers 3!_q.at n=29A069778
• Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n having k LD's (n>=0; 0<=k<=floor((n-1)/2)).at n=33A128733
• Half the number of length n integer sequences with sum zero and sum of squares 6728.at n=3A157590
• The number of permutations of length n sortable by 3 prefix reversals (in the pancake sorting sense).at n=30A228398
• Expansion of Product_{k>=1} (1 - x^(10*k))/(1 - x^k).at n=39A261776
• Number of connected induced (non-null) subgraphs of the gear graph with 2n+1 nodes.at n=7A286188
• Number of 5-element subsets of [n] having a prime element sum.at n=24A320680
• a(n) = m is the least m = b*c > a(n-1) such that (b+c)*n = m-1 where 1 < b <= c < m.at n=28A364171