23404

Appears in sequences

• a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026670.at n=6A026983
• Number of partitions of n with equal number of parts congruent to each of 1 and 2 (mod 5).at n=52A035556
• Numbers having four 5's in base 8.at n=24A043444
• Number of maximal sum-free subsets of {1,2,...,n}.at n=36A121269
• Number of n X 2 0..3 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.at n=40A201975
• Number of length n+5 0..3 arrays with some three disjoint pairs in each consecutive six terms having the same sum.at n=18A248484
• Number of (n+1)X(2+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements.at n=3A251022
• Number of (n+1)X(4+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements.at n=1A251024
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements.at n=11A251028
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements.at n=13A251028
• Positive integers whose square is the sum of 96 consecutive squares.at n=13A257827
• Pseudoprimes to base 5, written in base 5.at n=6A262102
• Number of nX3 0..1 arrays with every element equal to 1, 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=5A300925
• Number of nX6 0..1 arrays with every element equal to 1, 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=2A300928
• T(n,k)=Number of nXk 0..1 arrays with every element equal to 1, 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=30A300930
• T(n,k)=Number of nXk 0..1 arrays with every element equal to 1, 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=33A300930
• Number of unoriented series-parallel networks with n colored elements using exactly 2 colors.at n=6A339281
• Triangle read by rows: T(n,k) is the number of unoriented series-parallel networks with n colored elements using exactly k colors.at n=22A339282
• High water marks for number of primes between prime(n)^2 and prime(n+1)^2.at n=40A380135