22988

Appears in sequences

• a(n) = [ 2nd elementary symmetric function of {sqrt(k+1)} ], k = 1,2,...,n.at n=44A025219
• Number of base 16 circular n-digit numbers with adjacent digits differing by 2 or less.at n=6A124894
• Triangle T(n, k) = A172452(n) - A172452(k) - A172452(n-k), read by rows.at n=59A172970
• Triangle T(n, k) = A172452(n) - A172452(k) - A172452(n-k), read by rows.at n=61A172970
• Number of n X 3 0..3 arrays with rows, diagonals and antidiagonals unimodal and columns nondecreasing.at n=3A224168
• T(n,k) = number of n X k 0..3 arrays with rows, diagonals and antidiagonals unimodal and columns nondecreasing.at n=18A224173
• Number of 4 X n 0..3 arrays with rows, diagonals and antidiagonals unimodal and columns nondecreasing.at n=2A224175
• Number n such that the sum of its proper evil divisors (A001969) equals n.at n=33A230587
• Number of (n+1) X (2+1) 0..3 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4 (constant-stress 1 X 1 tilings).at n=11A235283
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 253", based on the 5-celled von Neumann neighborhood.at n=32A271052
• Number of anti-down steps in all modified skew Dyck paths of semilength n.at n=9A274405
• Number of n X n 0..2 arrays with no element equal to any value at offset (-1,-2) (-2,-1) (0,-1) or (-1,0) and new values introduced in order 0..2.at n=4A274797
• Number of n X 5 0..2 arrays with no element equal to any value at offset (-1,-2) (-2,-1) (0,-1) or (-1,0) and new values introduced in order 0..2.at n=4A274800
• T(n,k)=Number of nXk 0..2 arrays with no element equal to any value at offset (-1,-2) (-2,-1) (0,-1) or (-1,0) and new values introduced in order 0..2.at n=40A274803
• Numbers j in pairs (j,k), with j <> k +- 1, such that the sum of their cubes is equal to a centered cube number.at n=48A352135
• Number of nonempty subsets of {1, 2, ..., n} with GCD equal to 1 and containing the sum of any two elements whenever it is at most n.at n=24A358392
• a(n) = sum of minimal runlengths of all the partitions of n.at n=36A364808
• Detour index of n body-centered cubic grid unit cells in a row.at n=11A366817
• Number of integer compositions of n whose leaders of weakly decreasing runs are identical.at n=22A374742