19497

Appears in sequences

• a(n) = Sum_{k=1..n} -mu(k+1) * a(n-k), with a(0)=1.at n=19A073776
• Numbers m such that m*reversal(m) contains every decimal digit exactly once.at n=2A178929
• G.f. satisfies: A(x) = x + x*Sum{n>=0} x^n/n! * d^n/dx^n A(x)^(n+1).at n=7A187820
• Numbers k such that k!4 + 2^9 is prime, where k!4 = k!!!! is the quadruple factorial number (A007662).at n=31A291350
• Number of nX7 0..1 arrays with every element equal to 0, 1, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=7A302679