200200

Appears in sequences

• Number of ways to place a non-attacking white and black queen on n X n chessboard.at n=21A035291
• Number of ways to place two nonattacking queens on an n X n board.at n=25A036464
• Numbers k such that k^3 has only even digits.at n=33A052004
• Triangle of Stirling numbers of order 3.at n=25A059022
• n, n^2 and n^3 all use only even digits.at n=15A085586
• Triangle, read by rows, where T(n,k) = n!/(k!*(n-3*k)!*3^k) for n>=3*k>=0.at n=47A118931
• Triangle read by rows: T(n,k) is the number of set partitions of the set {1,2,...,n} (or of any n-set) containing k blocks of size 3 (0<=k<=floor(n/3)).at n=39A124503
• Numbers k not divisible by 6 such that sigma(k) > 3*k.at n=14A126104
• Numbers k such that k and k^2 use only the digits 0, 2, 3, 4 and 8.at n=43A136885
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 6 and 8.at n=48A136904
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 7 and 8.at n=54A136906
• Numbers k such that k and k^2 use only the digits 0, 2, 4 and 8.at n=26A136908
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 8 and 9.at n=50A136909
• Tetrahedron of numbers T(i,j,k) = (i+2*j+3*k)!/(i!*j!*k!*2^j*6^k) read with entries in the order defined in A144625.at n=53A144626
• Numbers whose decimal expansion contains only 0's and 2's.at n=36A169965
• Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k nonincreasing odd cycles (0<=k<=floor(n/3)). A cycle (b(1), b(2), ...) is said to be increasing if, when written with its smallest element in the first position, it satisfies b(1)<b(2)<b(3)<... . A cycle is said to be odd if it has an odd number of entries. For example, the permutation (152)(347)(6)(8) has 1 nonincreasing odd cycle.at n=39A186766
• Augmentation of the Fibonacci triangle A058071. See Comments.at n=33A193595
• Number of nX1 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to two or fewer horizontal or vertical neighbors.at n=12A199516
• Numbers k such that k^2 has only digits 0, 4 and 8.at n=30A202170
• In base 3, 0, together with numbers of the form i00j00k00m00... where i = 1 or 2 and j,k,m,... are 0, 1, or 2.at n=24A261660