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A211028
A list of ordered partitions of the positive integers.
0
1, 2, 1, 1, 3, 2, 1, 1, 1, 1, 2, 2, 4, 3, 1, 2, 1, 1, 1, 1, 1, 1, 3, 2, 5, 2, 2, 1, 4, 1, 3, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 4, 2, 3, 3, 6, 3, 2, 1, 5, 1, 2, 2, 1, 1, 4, 1, 1, 3, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 2, 2, 5, 2, 4, 3, 7, 2, 2, 2, 1
OFFSET
1,2
COMMENTS
We start with 1. Then for each positive integer j the sequence lists the partitions of j that do not contain 1 as a part, in lexicographical order. Then the sequence lists the partitions of j-1 together with one part of size 1 as the last part of that partition. Then the partitions of j-2 together with two parts of size 1, and so on.
EXAMPLE
Written as an irregular triangle, in which row n lists the partitions of n, the sequence begins:
{1};
{2},{1,1};
{3},{2,1},{1,1,1};
{2,2},{4},{3,1},{2,1,1},{1,1,1,1};
{3,2},{5},{2,2,1},{4,1},{3,1,1},{2,1,1,1},{1,1,1,1,1};
{2,2,2},{4,2},{3,3},{6},{3,2,1},{5,1},{2,2,1,1},{4,1,1},{3,1,1,1},{2,1,1,1,1},{1,1,1,1,1,1};
...
CROSSREFS
Sequence in context: A190688 A145975 A374683 * A239001 A277648 A026792
KEYWORD
nonn,tabf,changed
AUTHOR
Omar E. Pol, Oct 30 2012
STATUS
approved