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Search: id:A070778
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| A070778 |
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Let M denote the 6X6 matrix = row by row /1,1,1,1,1,1/1,1,1,1,1,0/1,1,1,1,0,0/1,1,1,0,0,0/1,1,0,0,0,0/1,0,0,0,0,0/ and A(n) the vector (x(n),y(n),z(n),t(n),u(n),v(n))=M^n*A where A is the vector (1,1,1,1,1,1); then a(n)=u(n). |
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+0
5
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| 1, 2, 11, 41, 176, 721, 3003, 12439, 51623, 214103, 888173, 3684174, 15282475, 63393324, 262962987, 1090800411, 4524765831, 18769248040, 77856998326, 322959774150, 1339674254489, 5557122741105, 23051583675890
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n) =2*A006359(n-1)-A006359(n-3) for n>2.
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CROSSREFS
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Cf. A006359, A069007, A069008, A069009, A070778, A006359(offset), for x(n), y(n), z(n), t(n), u(n), v(n).
Sequence in context: A062256 A024522 A121244 this_sequence A107020 A079808 A089658
Adjacent sequences: A070775 A070776 A070777 this_sequence A070779 A070780 A070781
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KEYWORD
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easy,nonn
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AUTHOR
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Henry Bottomley (se16(AT)btinternet.com), May 06 2002
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