OFFSET
1,5
COMMENTS
Second differences count a subset of unrestricted partitions; cf. A160648.
LINKS
Nathaniel Johnston, Table of n, a(n) for n = 1..2500
EXAMPLE
A160644 begins 1, 1, 2, 3, 4, 7, 10, 14, 22, 32, 45, 67, 95, 134, 192, ... so a(n) begins 0, 1, 1, 1, 3, 3, 4, 8, 10, 13, 22, 28, 39, 58, ...
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Alford Arnold, May 24 2009
STATUS
approved