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Search: id:A055797
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| 1, 6, 22, 64, 162, 372, 792, 1584, 3003, 5434, 9438, 15808, 25636, 40392, 62016, 93024, 136629, 196878, 278806, 388608, 533830, 723580, 968760, 1282320, 1679535, 2178306, 2799486, 3567232, 4509384
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OFFSET
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0,2
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COMMENT
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If Y is a 2-subset of an n-set X then, for n>=7, a(n-7) is the number of 7-subsets of X which have no exactly one element in common with Y. - Milan R. Janjic (agnus(AT)blic.net), Dec 28 2007
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LINKS
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Alexsandar Petojevic, The Function vM_m(s; a; z) and Some Well-Known Sequences, Journal of Integer Sequences, Vol. 5 (2002), Article 02.1.7
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FORMULA
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binomial(n,7)+binomial(n,5), n>=5. - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jul 24 2006
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MAPLE
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[seq(binomial(n, 7)+binomial(n, 5), n=5..34)]; - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jul 24 2006
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MATHEMATICA
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a=1; b=2; c=3; d=4; e=5; f=6; s=7; lst={s}; Do[a+=n; b+=a; c+=b; d+=c; e+=d; f+=e; s+=f; AppendTo[lst, s], {n, 6!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), May 24 2009]
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CROSSREFS
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Sequence in context: A166020 A120477 A053739 this_sequence A001925 A002663 A099855
Adjacent sequences: A055794 A055795 A055796 this_sequence A055798 A055799 A055800
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KEYWORD
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nonn
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu), May 28 2000
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