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A151821
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Powers of 2, omitting 2 itself.
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15
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1, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576, 2097152, 4194304, 8388608, 16777216, 33554432, 67108864, 134217728, 268435456, 536870912, 1073741824, 2147483648, 4294967296, 8589934592
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Different from A046055.
An elephant sequence, see A175655. For the central square just one A[5] vector, with decimal value 170, leads to this sequence. For the corner squares this vector leads to the companion sequence A095121. [Johannes W. Meijer (meijgia(AT)hotmail.com), Aug 15 2010]
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FORMULA
| G.f.: x(1+2x)/(1-2x). [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Sep 17 2009]
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CROSSREFS
| Sequence in context: A046055 A186949 A020707 * A147639 A049934 A089890
Adjacent sequences: A151818 A151819 A151820 * A151822 A151823 A151824
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jul 08 2009
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