21790

Appears in sequences

• Numbers n such that n through n+5 have the same number of distinct prime factors.at n=26A045934
• Numbers that are sums of 2 or more consecutive squares in more than 1 way.at n=29A062681
• Triangle related to generalized Euler numbers of type 2^n (A005799).at n=24A088990
• Triangle related to generalized Euler numbers of type 2^n (A005799).at n=25A088990
• Numbers that are the sum of one or more consecutive squares in more than one way.at n=36A130052
• 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, 1, 0), (1, 0, -1), (1, 1, 1)}.at n=9A149262
• Number of arrays of median of three adjacent elements of some length-5 0..n array, with no adjacent equal elements in the latter.at n=26A229013
• Number of n X 3 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.at n=5A284160
• Number of n X 6 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.at n=2A284163
• T(n,k) = Number of n X k 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.at n=30A284165
• T(n,k) = Number of n X k 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.at n=33A284165
• Numbers that can be written as the sum of four or more consecutive squares in more than one way.at n=20A307937
• G.f.: Sum_{k>=0} x^(k*(k+1)/2) / Product_{j=1..k} (1 - x^(2*j-1))^2.at n=41A376624