142400

Appears in sequences

• Coefficients in asymptotic (divergent) expansion for Sum_{k=1..n} 1/C(n,k)^2.at n=10A076687
• Numbers k such that the concatenation of k with 4*k gives a square.at n=23A115535
• Expansion of (1+x)/(1+x-2*x^2-3*x^3).at n=29A250103
• Numbers k such that there are exactly 9 numbers j for which binomial(k, floor(k/2)) / binomial(k,j) is an integer, i.e., A080383(k) = 9.at n=22A327431
• Primitive numbers that are the sum of the squares of two of their distinct divisors.at n=33A338485
• a(n) is the number of large or small squares that are used to tile primitive squares of type 1 whose length of side is A344333(n).at n=29A344334
• a(n) is the number of large or small squares that are used to tile primary squares of type 1 (see A344331) whose side length is A345285(n).at n=38A345286
• Bitwise XOR (centrally aligned) of two consecutive terms of A122242.at n=5A376402