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Search: id:A093918
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| A093918 |
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a(2k-1)=(2k-1)^2+k, a(2k)=6k^2+k+1: Last term in rows of triangle A093915. |
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+0
4
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| 2, 8, 11, 27, 28, 58, 53, 101, 86, 156, 127, 223, 176, 302, 233, 393, 298, 496, 371, 611, 452, 738, 541, 877, 638, 1028, 743, 1191, 856, 1366, 977, 1553, 1106, 1752, 1243, 1963, 1388, 2186, 1541, 2421, 1702, 2668, 1871, 2927, 2048, 3198, 2233, 3481, 2426, 3776
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OFFSET
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1,1
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COMMENT
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Initially defined as "leading diagonal" of the triangle A093915, a(n) is the last term in row n of A093915, i.e. a(n)=A093916(n)+n-1. - M. F. Hasler, Apr 04 2009
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FORMULA
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A093918 = A093915 o A000217 = A093916 + A023443. - M. F. Hasler, Apr 04 2009
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PROGRAM
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(PARI) A093918(n)=if(n%2, n^2, 6*(n\2)^2)+n\2+1 \\ - M. F. Hasler, Apr 04 2009
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CROSSREFS
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Cf. A093915, A093916, A093917.
Sequence in context: A090746 A089118 A146480 this_sequence A135132 A007543 A043377
Adjacent sequences: A093915 A093916 A093917 this_sequence A093919 A093920 A093921
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 25 2004
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EXTENSIONS
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Edited and extended beyond a(6) by M. F. Hasler (MHasler(AT)univ-ag.fr), Apr 04 2009
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