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Search: id:A133092
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| 1, 4, 6, 16, 15, 36, 28, 64, 45, 100, 66, 121, 91, 144, 120, 169, 153, 196, 190, 225, 231, 256, 276, 289
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OFFSET
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1,2
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FORMULA
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Squares interleaved with hexagonal numbers, A000384; such that A000384(n), (n,odd) = A000384((n+1)/2)
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EXAMPLE
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a(4) = 16 = sum of row 4 terms of triangle A133091: (2 + 4 + 6 + 4).
a(4) = 16 = 4^2.
a(7) = 28 = A000384(4), where A000384 = (1, 6, 15, 28, 45, 66, 91,...).
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CROSSREFS
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Cf. A133091, A000384.
Sequence in context: A088843 A154784 A062955 this_sequence A056222 A138624 A071428
Adjacent sequences: A133089 A133090 A133091 this_sequence A133093 A133094 A133095
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KEYWORD
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nonn
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Sep 09 2007
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