20141

Appears in sequences

• Squares written in base 5.at n=36A001740
• a(n) = Sum_{i=0..n} T(i,n-i), array T as in A049723.at n=26A049724
• Least number k such that the decimal representation of 1/k has period Fibonacci(n).at n=13A170945
• The number of 2 X 2 matrices with all eigenvalues real and whose entries are integers with absolute value at most n.at n=5A219736
• Number of partitions of n whose minimal excluded multiplicity is even.at n=40A299408
• Number of nX4 0..1 arrays with every element unequal to 0, 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=13A317760
• Numbers k such that both k and k+2 are de Polignac numbers (A006285).at n=30A330284
• G.f. A(x) satisfies: A(x) = 1 + x + x^2 + x^3 + x^4 + x^5 + x^6 * A(x/(1 - 2*x)) / (1 - 2*x).at n=15A351345
• a(n) = (n+1)^4 written in base n.at n=4A362445