20020

Appears in sequences

• From the enumeration of corners.at n=5A006333
• From the enumeration of corners.at n=4A006334
• Numerator of n*(n-2)*(2*n-1)/(2*(n-1)).at n=26A022997
• n written in fractional base 4/2.at n=36A024630
• a(n) = (n+1)*binomial(n+5, 5).at n=9A027810
• Expansion of 1/((1-x)^4*(1-x^2)^2).at n=21A028346
• Expansion of sum ( q^n / product( 1-q^k, k=1..4*n), n=0..inf ).at n=31A035296
• Number of ways to place two nonattacking queens on an n X n board.at n=14A036464
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/6 of the elements are <= (n-2)/3.at n=18A048025
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/6 of the elements are <= (n-3)/3.at n=18A048036
• Number of nonempty subsets of {1,2,...,n} in which exactly 2/5 of the elements are <= (n-4)/2.at n=17A048066
• Number of nonempty subsets of {1,2,...,n} in which exactly 2/5 of the elements are <= (n+3)/3.at n=17A048088
• Denominators of column 2 of table described in A051714/A051715.at n=10A051719
• Duplicate of A027810.at n=9A051922
• Numbers k such that k^3 has only even digits.at n=21A052004
• Triangle in A059037 read by rows from left to right.at n=29A059038
• Triangle in A059037 read by rows in natural order.at n=29A059039
• Non-palindromic number and its reversal are both multiples of 14.at n=35A062913
• Multiples of 4 whose digits add to 4.at n=19A063997
• n repeated in decimal representation, but separated by enough zeros that the square has the pattern (n^2)(2n^2)(n^2).at n=19A077431