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A130822
Two 1's, one 2, four 3's, three 4's ...
0
1, 1, 2, 3, 3, 3, 3, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12
OFFSET
1,3
MATHEMATICA
{Table[#[[1]], #[[2]]], Table[#[[2]], #[[1]]]}&/@Partition[Range[20], 2]// Flatten (* Harvey P. Dale, Aug 27 2019 *)
CROSSREFS
Sequence in context: A297212 A155934 A251719 * A194220 A189627 A194227
KEYWORD
nonn
AUTHOR
Paul Curtz, Jul 17 2007
STATUS
approved