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A160646
First differences of A160644.
2
0, 1, 1, 1, 3, 3, 4, 8, 10, 13, 22, 28, 39, 58, 77, 104, 148, 197, 265, 363, 481, 638, 858, 1126, 1480, 1953, 2544, 3309, 4312, 5566, 7175, 9246, 11843, 15136, 19328, 24564, 31158, 39466, 49811, 62737, 78900, 98931, 123817, 154707, 192830, 239911, 298013
OFFSET
1,5
COMMENTS
Second differences count a subset of unrestricted partitions; cf. A160648.
LINKS
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