23315

Appears in sequences

• Euler transform of Euler totient function phi(n), cf. A000010.at n=22A061255
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 0, 0), (-1, 1, 1), (0, -1, 0), (1, 1, 0)}.at n=9A149241
• Number of binary arrays indicating the locations of trailing edge maxima of a random length-n 0..3 array extended with zeros and convolved with 1,2,1.at n=21A222122
• Number of n X n 0..1 arrays with each 1 horizontally or vertically adjacent to 1, 3 or 4 1's.at n=4A295545
• Number of nX5 0..1 arrays with each 1 horizontally or vertically adjacent to 1, 3 or 4 1s.at n=4A295548
• T(n,k)=Number of nXk 0..1 arrays with each 1 horizontally or vertically adjacent to 1, 3 or 4 1s.at n=40A295551
• a(n) = Sum_{k=0..n} (k+2) * binomial(4*n-3*k+2,n-k)/(4*n-3*k+2).at n=6A390720
• Odd semiprimes p*q, such that Stern polynomial B(p*q,x) is a product of B(p,x) and B(q,x).at n=49A391256