133498

Appears in sequences

• a(1) = 1; for n>1, a(n) = n*a(n-1) - 1 if n is a prime else a(n) = n*a(n-1) + 1.at n=8A093464
• Number of n X n binary arrays, symmetric about the diagonal and under 90-degree rotation, with every 1 adjacent to at least one other 1 both bishopwise and rookwise but with no three 1s in a row bishopwise or rookwise.at n=18A144241
• Number of (w,x,y,z) with all terms in {1,...,n} and w >= (geometric mean of x,y,z).at n=22A212142