131841

Appears in sequences

• Define the sequence S(a(0), a(1)) by a(n+2) is the least integer such that a(n+2)/a(n+1) > a(n+1)/a(n) for n >= 0 . This is S(2,32).at n=4A022019
• The (2^n+1)-th triangular number (cf. A000217).at n=9A028401
• Triangle T, read by rows, equal to the matrix cube of triangle A113095, which satisfies the recurrence: A113095(n,k) = [A113095^4](n-1,k-1) + [A113095^4](n-1,k).at n=18A113099
• Number of lines in a Pauli graph of order n.at n=7A127069
• Positive integers that are palindromes (of even length) in binary, each made by concatenating two identical binary palindromes.at n=30A161400
• 1/4 the number of (n+1) X 2 binary arrays with all 2 X 2 subblock sums the same.at n=17A183978
• a(n) = 3*a(n-2) - a(n-3), with a(0)=0, a(1)=-3, and a(2)=6.at n=18A215666
• Triangular numbers k such that phi(k) is a square number, where phi(k) is the Euler totient function (A000010).at n=14A287473
• Fold a square sheet of paper alternately vertically to the left and horizontally downwards; after each fold, draw a line along each inward crease; after n folds, the resulting graph has a(n) regions with minimal area.at n=21A342763
• Triangular numbers that are binary palindromes.at n=19A350987