OFFSET
1,4
COMMENTS
a(1) = 1 by convention.
Is this sequence is nonnegative? If so, is there a combinatorial interpretation?
EXAMPLE
We have p(33) = s(6) + 2 s(33) - s(51) + 2 s(222) - 2 s(321) + s(411) + s(3111) - s(21111) + s(111111). The coefficients add up to 4, and the Heinz number of (33) is 25, so a(25) = 4.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Gus Wiseman, Sep 14 2018
STATUS
approved