1,4

a(2^n) = n! for n>=0. a(2^n+2^m) = a(2^(m+1)) for n>m>=0.

a(n) = A000120(n)! (factorial of the number of 1's in binary expansion of n).

Cf. A093658.

Cf. A093677, A000120.

Sequence in context: A058701 A004559 A095291 this_sequence A067541 A054706 A081727

Adjacent sequences: A093656 A093657 A093658 this_sequence A093660 A093661 A093662

nonn

Paul D. Hanna (pauldhanna(AT)juno.com), Apr 08 2004