4,2
Cf. A000085 (row sums 1), A000986 (row sums 2), A110040 (row sums 3).
Adjacent sequences: A139667 A139668 A139669 this_sequence A139671 A139672 A139673
Sequence in context: A094738 A143900 A091742 this_sequence A037138 A091429 A106710
nonn
Ron Hardin (rhh(AT)cadence.com), Jun 12 2008
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