147941

Appears in sequences

• Number of fixed n-celled polyominoes which need only touch at corners.at n=7A006770
• Numbers n such that n'' = n'+1 where n' and n'' are respectively the first and the second arithmetic derivative of n (A003415).at n=31A189639
• Numerator of the sum of inverse products of parts in all partitions of n.at n=11A322364
• Numbers k for which sigma(k) = k + k'', where k'' is the second derivative of k (A068346).at n=32A348426