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Search: id:A067239
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| A067239 |
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a(0)=1, a(n)=8n*(2n-1). |
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+0
3
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| 1, 8, 48, 120, 224, 360, 528, 728, 960, 1224, 1520, 1848, 2208, 2600, 3024, 3480, 3968, 4488, 5040, 5624, 6240, 6888, 7568, 8280, 9024, 9800, 10608, 11448, 12320, 13224, 14160, 15128, 16128, 17160, 18224, 19320, 20448, 21608, 22800, 24024
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Engel expansion of cosh(1/2).
Also, 8 times hexagonal numbers (A000384(n)*8 = A152750(n)), for n>0. [From Omar E. Pol (info(AT)polprimos.com), Dec 14 2008]
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MATHEMATICA
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s=0; lst={s}; Do[s+=n++ +8; AppendTo[lst, s], {n, 0, 8!, 32}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 16 2008]
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CROSSREFS
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Cf. A006784 for Engel expansion definition
Cf. A000384, A152750. [From Omar E. Pol (info(AT)polprimos.com), Dec 14 2008]
Sequence in context: A165037 A121028 A139279 this_sequence A152750 A121355 A035471
Adjacent sequences: A067236 A067237 A067238 this_sequence A067240 A067241 A067242
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KEYWORD
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easy,nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 03 2002
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