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Search: id:A027178
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| A027178 |
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a(n) = T(n,0) + T(n,1) + ... + (T(n,n), T given by A027170. |
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+0
1
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| 1, 6, 20, 52, 120, 260, 544, 1116, 2264, 4564, 9168, 18380, 36808, 73668, 147392, 294844, 589752, 1179572, 2359216, 4718508, 9437096, 18874276, 37748640, 75497372, 150994840, 301989780, 603979664, 1207959436, 2415918984
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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9*2^n - 4n - 8 (conjectured). - R. Stephan, Feb 13 2004
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MATHEMATICA
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s=1; lst={s}; Do[s+=(s+=n++); AppendTo[lst, s], {n, 2, 5!, 2}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 15 2008]
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CROSSREFS
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Sequence in context: A119365 A001211 A122225 this_sequence A055909 A036596 A038091
Adjacent sequences: A027175 A027176 A027177 this_sequence A027179 A027180 A027181
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KEYWORD
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nonn
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu)
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