81984

Appears in sequences

• Unsigned member s=2 of a family of generalizations of the (signed) Lah triangle A008297. All numbers divided by 2.at n=33A136657
• G.f.: A(x) = exp( 2*Sum_{n>=1} 2^n/A006519(n) * x^n/n ), where A006519(n) = highest power of 2 dividing n.at n=14A162588
• G.f.: exp( Sum_{n>=1} A068963(n)*x^n/n ) where A068963(n) = Sum_{d|n} phi(d^3).at n=15A226106
• Triangle read by rows: T(m,n) is the Szeged index of the grid graph P_m X P_n (1 <= n <= m).at n=42A245826
• Numbers containing only 1's and 0's in their base-2, base-3, and base-4 representations.at n=24A258981
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 150", based on the 5-celled von Neumann neighborhood.at n=16A279248
• Numbers k for which sigma(k) >= 2*k and (sigma(k) - 2*k) AND k = k, where AND is bitwise-and, A004198.at n=42A388026