21482

Appears in sequences

• Number of ways of placing kings with no more than 1 mutual attack on an n X n chessboard symmetric about main diagonal.at n=7A143872
• 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, -1), (-1, 0, 0), (0, 0, 1), (1, -1, 0), (1, 1, 0)}.at n=8A150229
• a(n) = Sum_{y=1..n} Sum_{x=1..n} floor((x^k + y^k)^(1/k)) with k = 3.at n=30A211792
• Number of n X 3 0..1 arrays with rows, diagonals and antidiagonals unimodal and columns nondecreasing.at n=30A223833
• Number of compositions of n having exactly four fixed points.at n=14A240739
• Number of length 1+3 0..n arrays with every four consecutive terms having the sum of some three elements equal to three times the fourth.at n=24A248538
• Numbers n such that the Collatz iterations for n and n + 1 have the same length (A078417) but do not meet a certain condition. (See comments.)at n=33A274410
• a(n) = Sum_{i=1..n} prime(n*(i - 1) + i).at n=18A319012
• a(n) is the number of terms in the analog of A121805 but starting with n, or -1 if that sequence is infinite.at n=18A330128