24176

Appears in sequences

• Triangle: Number of asymmetric semigroups of order n with k idempotents, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).at n=23A058170
• The sum over all subsets S of [n] of the squares of the number of permutations with descent set = S.at n=6A060350
• Total number of possible standard knight moves on an n X 2n chessboard, if the knight is placed anywhere.at n=39A180319
• Number of nX5 0..4 arrays with each element equal to the number its horizontal and vertical neighbors equal to itself.at n=9A195966
• Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2>2x^2+2y^2.at n=29A211633
• Number T(n,k) of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=k if n>0; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=29A262372
• Number T(n,k) of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=k if n>0; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=35A262372
• Number of perfect cube parts in all partitions of n.at n=30A264392
• Numbers n such that the decimal number concat(5,n) is a square.at n=36A273360
• a(n) = a(n-1) + a(n-2) + 2 a(ceiling(n/2)), where a(0) = 1, a(1) = 2, a(2) = 3.at n=16A298351
• Number of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=7.at n=0A321063
• A(n,k) is the sum of the k-th powers of the descent set statistics for permutations of [n]; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=42A334622
• Triangular array read by rows. T(n,k) is the number of ordered pairs of n-permutations with exactly k rise/falls or fall/rises, n >= 0, 0 <= k <= max{0,n-1}.at n=16A362745
• Triangular array read by rows. T(n,k) is the number of ordered pairs of n-permutations with exactly k rise/falls or fall/rises, n >= 0, 0 <= k <= max{0,n-1}.at n=21A362745