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A011874
[ n(n-1)/21 ].
+0
2
0, 0, 0, 0, 0, 0, 1, 2, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 33, 36, 38, 41, 44, 47, 50, 53, 56, 60, 63, 66, 70, 74, 78, 82, 86, 90, 94, 98, 102, 107, 112, 116, 121, 126, 131, 136, 141
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Maintained by
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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.
AT&T Labs Research
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