22711

Appears in sequences

• Base-3 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,1.at n=9A033121
• Number of strictly increasing arrangements of 4 numbers in -(n+2)..(n+2) with sum zero.at n=44A188182
• Number of n X n 0..4 arrays with each element equal to the number of its horizontal and vertical neighbors within one of itself.at n=6A196011
• Number of n X 7 0..4 arrays with each element equal to the number its horizontal and vertical neighbors within one of itself.at n=6A196016
• Absolute discriminants of complex quadratic fields with 3-class rank 2.at n=28A242862
• Absolute discriminants of complex quadratic fields with 3-class group of elementary abelian type (3,3) of rank 2.at n=19A242863
• Absolute discriminants of complex quadratic fields with 3-class group of type (3,3) and Hilbert 3-class field tower of exact length 2.at n=8A242864
• Absolute discriminants of complex quadratic fields with 3-class group of type (3,3) and 3-principalization type (2241).at n=4A247689
• Absolute discriminants of complex quadratic fields with 3-class group of type (3,3) whose second 3-class group is located on the sporadic part of the coclass graph G(3,2) outside of coclass trees.at n=11A247691
• The number of permutations p of {1,...,n} such that p(1)=1, p(n)=n, and |p(i)-p(i+1)| is in {1,2,3} for all i from 1 to n-1.at n=15A249665
• Expansion of Product_{k>0} 1/(Sum_{m>=0} x^(k*m^2)).at n=49A320119
• a(n) is the number of sets of distinct four-cuboid combinations that fill an n X n X n cube excluding combinations that contain cube-shaped cuboids.at n=28A386756
• Number of multisets summing to n that do not contain 1 and are not the first sums of any multiset.at n=48A390431