0,3
It would be nice to have a formula for the 2^(n-1)th coefficient.
The exponent of x in P(n) with a(n) as coefficient is {1,1,2,5,9,19,37,74,147,294,587,1175,...}.
(PARI) P(n)=if(n<1, x, P(n-1)*(P(n-1)+1))
(PARI) a(n)=vecmax(Vec(P(n)))
Cf. A016131.
Sequence in context: A161181 A073834 A111837 * A079278 A015178 A206152
Adjacent sequences: A092120 A092121 A092122 * A092124 A092125 A092126
nonn
Ralf Stephan, Apr 02 2004
