1,2
The following triangle of 4 rows satisfies the requirements:
....1
...3 2
..4 5 8
.6 7 9 10
a(n)=6*A64050(n) for n>1.
Sequence in context: A165638 A122829 A038033 this_sequence A018981 A052594 A091097
Adjacent sequences: A064046 A064047 A064048 this_sequence A064050 A064051 A064052
more,nonn
Floor van Lamoen (fvlamoen(AT)hotmail.com), Aug 24 2001
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