OFFSET
0,4
EXAMPLE
The a(1) = 1 through a(7) = 15 unordered pairs of strict partitions:
{1,1} {2,2} {3,3} {4,4} {5,5} {6,6} {7,7}
{3,21} {4,31} {5,32} {6,42} {7,43}
{21,21} {31,31} {5,41} {6,51} {7,52}
{32,32} {42,42} {7,61}
{32,41} {42,51} {43,43}
{41,41} {51,51} {43,52}
{6,321} {43,61}
{42,321} {52,52}
{51,321} {52,61}
{321,321} {61,61}
{7,421}
{43,421}
{52,421}
{61,421}
{421,421}
MATHEMATICA
Table[Length[Select[Tuples[Select[IntegerPartitions[n], UnsameQ@@#&], 2], OrderedQ]], {n, 0, 30}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Gus Wiseman, Oct 08 2023
STATUS
approved