1863225

Appears in sequences

• Squares of odd elements in Pascal triangle that are not 1.at n=39A014725
• Squares of numbers in array formed from odd elements to the right of middle of rows of Pascal triangle that are not 1.at n=21A014760
• Squares of numbers in array formed from odd elements to the right of middle of rows of Pascal triangle.at n=35A014761
• Squares of second pentagonal numbers: a(n) = (1/4)*n^2*(3*n+1)^2.at n=30A100256
• First differences of A138477.at n=23A138495
• Squares of Jacobsthal numbers.at n=12A139818
• Odd abundant numbers whose abundance is odd.at n=8A156942
• Number of n X 3 arrays with every diagonal and antidiagonal of length L containing a permutation of 1..L.at n=21A179808
• a(n) = A061037(n)^2.at n=35A181763
• Numbers with prime factorization p^2*q^2*r^2*s^2 where p, q, r, and s are distinct primes.at n=27A190377
• a(n) = binomial(n+4, n)^2. Square of the fifth diagonal sequence of A007318 (Pascal). Fifth diagonal sequence of A008459.at n=11A288876
• a(n) is the number of subsets of {1..n} that contain 4 even and 4 odd numbers.at n=30A331575
• The squares of squarefree numbers (A062503), ordered lexicographically according to their prime factors. a(n) = Product_{k in I} prime(k+1)^2, where I are the indices of nonzero binary digits in n = Sum_{k in I} 2^k.at n=46A334110
• Odd noninfinitary abundant numbers: the odd terms of A348274.at n=7A348275
• a(n) = sigma_2(n)^2.at n=31A356533
• a(n) = A112387(n)^2.at n=23A374098
• a(n) = A135318(n)^2.at n=22A374927