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A133600
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Row sums of triangle A133599.
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2
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1, 4, 7, 16, 28, 64, 112, 256, 448, 1024, 1792, 4096, 7168, 16384, 28672, 65536, 114688, 262144, 458752, 1048576, 1835008, 4194304, 7340032, 16777216, 29360128, 67108864, 117440512, 268435456, 469762048, 1073741824, 1879048192
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| For even indexed terms, a(n) = 2^n. For odd indexed terms, a(n) = 7 * 2^(n-3).
G.f.: -x*(x+1)*(3*x+1)/(2*x-1)/(2*x+1). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 14 2007
a(n) = 4*a(n-2) for n > 3; a(1) = 1, a(2) = 4, a(3) = 7. [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Nov 26 2009]
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EXAMPLE
| a(4) = 16 = sum of row 4 terms of triangle A133599 = (3 + 7 + 5 + 1).
a(4) = 16 = 2^4.
a(7) = 112 = 7 * 2^4 = 7 * 16.
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PROG
| (PARI) {vector(31, n, if(n==1, 1, if(n%2>0, 7*2^(n-3), 2^n)))} [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Nov 26 2009]
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CROSSREFS
| Cf. A133599.
Sequence in context: A005513 A025619 A093210 * A051049 A108122 A192800
Adjacent sequences: A133597 A133598 A133599 * A133601 A133602 A133603
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KEYWORD
| nonn
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AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Sep 18 2007
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EXTENSIONS
| More terms from Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Nov 26 2009
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