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Search: id:A139116
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| 1, 3, 10, 21, 78, 136, 171, 465, 1830, 3916, 5671, 8001, 135460, 183921, 817281, 2425503, 2600340, 5172936, 9041878, 9779253, 46933516, 49406770, 62860078
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OFFSET
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1,2
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FORMULA
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a(n)=A000043(n)*(A000043(n)-1)/2.
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CROSSREFS
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Cf. A000043, A000217, A036689, A139306, A139307, A139116, A139223, A139224, A139225, A139226.
Sequence in context: A008837 A081950 A071563 this_sequence A120109 A068082 A058077
Adjacent sequences: A139113 A139114 A139115 this_sequence A139117 A139118 A139119
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KEYWORD
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nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), May 10 2008
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