21682

Appears in sequences

• Numbers k that divide 4^k + 4.at n=15A015889
• Even 10-gonal (or decagonal) numbers.at n=37A028994
• Number of partitions satisfying cn(1,5) + cn(4,5) < cn(2,5) + cn(3,5).at n=42A039892
• Triangle read by rows: T(n,k) is the number of permutations of [n] having k-1 alternating descents (1<=k<=n). The index i is an alternating descent of a permutation p if either i is odd and p(i)>p(i+1), or i is even and p(i)<p(i+1).at n=37A145876
• Triangle read by rows: T(n,k) is the number of permutations of [n] having k-1 alternating descents (1<=k<=n). The index i is an alternating descent of a permutation p if either i is odd and p(i)>p(i+1), or i is even and p(i)<p(i+1).at n=43A145876
• Number of partitions p of n such that median(p) = multiplicity(max(p)).at n=45A240209
• Number of maximal cliques in the n X n queen graph.at n=30A288947
• The number of partitions of n in which at least one part is a multiple of 3.at n=38A295341
• Number of broken alternating permutations of n things.at n=9A302691
• Number of permutations of [n] having exactly seven alternating descents.at n=1A302900
• Number of integer partitions of n having a unique mode.at n=38A362608