2826240domain: NAppears in sequencesDeterminant of the n X n matrix with (i,j)-entry (i,j = 0,...,n-1) equal to 1 or 0 according as n + i - j and n - i + j are both prime or not.at n=50A228623Expansion of x*(1 + x)/(1 - 2*x)^3.at n=15A276289p-INVERT of (1,1,1,1,1,...), where p(S) = (1 - S^2)^3.at n=18A291013