23265

Appears in sequences

• Number of 3 X 3 integer matrices with elements in the range [ -n,n ] which represent a rotation of order 2.at n=12A053171
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 1), (1, 0, 0), (1, 1, -1)}.at n=11A148130
• a(n+1)-+a(n)=prime, a(n+1)*a(n)=Average of twin prime pairs, a(1)=3,a(2)=10.at n=36A154496
• Number of 0..n arrays x(0..3) of 4 elements with each no smaller than the sum of its previous elements modulo (n+1).at n=18A200253
• Number of undirected labeled graphs on n nodes with exactly 9 cycle graphs as connected components.at n=3A215769
• Number of undirected labeled graphs on n+3 nodes with exactly n cycle graphs as connected components.at n=9A215773
• E.g.f.: exp((1-5*x)^(-1/5)-1)/(1-5*x).at n=4A239301
• Triangle T(n, k) = Numbers of ways to place k points on a triangular grid of side n so that no two of them are adjacent. Triangle read by rows.at n=35A239567
• Number of ways to place 4 points on a triangular grid of side n so that no two of them are adjacent.at n=5A239570
• Number of partitions p of n such that (number of numbers in p of form 3k) = (number of numbers in p of form 3k+1).at n=45A241744
• Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 5 6 or 7.at n=6A252195
• Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 5 6 or 7.at n=1A252200
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 5 6 or 7.at n=29A252201
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 5 6 or 7.at n=34A252201
• a(n) = A261236(n) - A261237(n).at n=14A261230
• Number of ordered set partitions of [n] with nondecreasing block sizes and maximal block size equal to eight.at n=4A272498
• Numbers k such that 383*2^k+1 is prime.at n=1A322935
• Odd numbers k such that sigma(k^2) > 2*k^2 and A003415(sigma(k^2)) < k^2.at n=49A347891
• Numbers k for which A354102(k) = A354102(sigma(k)).at n=18A354106