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Search: id:A131912
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| 1, 7, 12, 18, 23, 29, 34, 40, 45, 51, 56, 62, 67, 73, 78, 84, 89, 95, 100, 106, 111, 117, 122, 128, 133, 139, 144, 150, 155, 161, 166, 172, 177, 183, 188, 194, 199, 205, 210, 216, 221, 227, 232, 238, 243, 249, 254, 260, 265, 271, 276, 282, 287, 293, 298
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OFFSET
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1,2
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FORMULA
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Binomial transform of (1, 6, -1, 2, -4, 8, -16,...).
a(n)=11*n-a(n-1)-14 (with a(1)=1) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 27 2009]
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EXAMPLE
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a(4) = 18 = sum of row 4 terms, triangle A131911: (8 + 1 + 2 + 7).
a(4) = 18 = (1, 3, 3, 1) dot (1, 6, -1, 2) = (1 + 18 -3, 2).
For n=2, a(2)=11*2-1-14=7; n=3, a(3)=11*3-7-14=12; n=4, a(4)=11*4-12-14=18 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 27 2009]
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CROSSREFS
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Cf. A131911.
Sequence in context: A092094 A064665 A142337 this_sequence A022953 A030714 A061141
Adjacent sequences: A131909 A131910 A131911 this_sequence A131913 A131914 A131915
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KEYWORD
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nonn,new
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 27 2007
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EXTENSIONS
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More terms a(11)-a(55) Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 27 2009
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