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A081880
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Triangle read by rows: n-th row gives trajectory of 2n under the map x->(x^2-4)/6, stopping when the next term would be negative or nonintegral.
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0
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0, 2, 0, 4, 2, 0, 6, 8, 10, 16, 42, 10, 16, 42, 12, 14, 32, 170, 4816, 3865642, 2490531345360, 16, 42, 18, 20, 66, 22, 80, 1066, 189392, 5978221610, 5956522269711832016, 5913359591595499145281505571167104042, 5827970276585748074286667660065476529979312208145367609757859954142122960, 24, 26
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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LINKS
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Table of n, a(n) for n=0..35.
Pierre Abbat, The 64-100 Sequences
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EXAMPLE
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8 -> (64-4)/6 = 10 -> (100-4)/6 = 16 -> (256-4)/6 = 42 -> (42^2-4)/6 nonintegral, so stop; thus row 4 is (8, 10, 16, 42).
Triangle begins:
0,
2, 0,
4, 2, 0,
6,
8,
10, 16, 42, 10, 16, 42,
12,
14, 32, 170, 4816, 3865642, 2490531345360,
16, 42,
18,
20, 66,
22, 80, 1066, 189392, 5978221610, 5956522269711832016, 5913359591595499145281505571167104042, 5827970276585748074286667660065476529979312208145367609757859954142122960,
24,
...
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CROSSREFS
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Sequence in context: A319690 A341419 A185879 * A144289 A293815 A339941
Adjacent sequences: A081877 A081878 A081879 * A081881 A081882 A081883
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KEYWORD
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nonn,tabf
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AUTHOR
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Pierre Abbat, Apr 12, 2003
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STATUS
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approved
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