18423

Appears in sequences

• a(n) = Sum_{k=0..2n} (k+1) * A026568(n, k).at n=8A027281
• Number of partitions in parts not of the form 11k, 11k+3 or 11k-3. Also number of partitions with at most 2 parts of size 1 and differences between parts at distance 4 are greater than 1.at n=44A035946
• Values of A038005 ending in 3.at n=22A038013
• Fourth column (r=3) of FS(3) staircase array A062745.at n=45A062748
• Numbers k such that k and k+1 have the same sum of unitary divisors (A034448).at n=29A064125
• Moebius transform of tetrahedral numbers.at n=46A117108
• a(n) = 729*n - 531.at n=25A156771
• Triangle of coefficients of polynomials v(n,x) jointly generated with A208765; see the Formula section.at n=53A208766
• Triangle read by rows: T(n,k) is the number of permutations of n elements with k the (smallest) header (first element) of the longest descending subsequence.at n=39A224652
• Triangle read by rows: T(n,k) (n>=1, 0<=k<n) is the number of permutations of n with maximal difference k between elements in the same cycle.at n=41A263757
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 141", based on the 5-celled von Neumann neighborhood.at n=29A270284
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 901", based on the 5-celled von Neumann neighborhood.at n=23A273744
• Numbers k such that (388*10^k - 1)/9 is prime.at n=18A295625
• Numbers n for which A325565(n) < A325568(n).at n=43A325569
• Numbers k such that k and k+1 have the same average of unitary divisors.at n=20A349222
• Number of integer compositions of n whose leaders of maximal strictly increasing runs are not weakly decreasing.at n=16A375135