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Search: id:A100461
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| A100461 |
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Triangle read by rows, based on array described below. |
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+0
8
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| 1, 1, 2, 1, 2, 4, 3, 4, 6, 8, 7, 8, 9, 12, 16, 25, 26, 27, 28, 30, 32, 49, 50, 51, 52, 55, 60, 64, 109, 110, 111, 112, 115, 120, 126, 128, 229, 230, 231, 232, 235, 240, 245, 248, 256, 481, 482, 483, 484, 485, 486, 490, 496, 504, 512, 1003, 1004, 1005
(list; table; graph; listen)
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OFFSET
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1,3
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COMMENT
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Form an array a(m,n) (n >= 1, 1 <= m <= n) by: a(1,n) = 2^(n-1) for all n; a(m+1,n) = (n-m)*floor( (a(m,n)-1)/(n-m) ) for 1 <= m <= n-1.
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EXAMPLE
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Array begins:
1 2 4 8 16 32...
* 1 2 6 12 30...
* * 1 4 9 28...
* * * 3 8 27...
* * * * 7 26...
* * * * * 25...
and triangle begins:
1
1 2
1 2 4
3 4 6 8
7 8 9 12 16
...
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CROSSREFS
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Cf. A100452, A100462, A119444.
Adjacent sequences: A100458 A100459 A100460 this_sequence A100462 A100463 A100464
Sequence in context: A099312 A117505 A131380 this_sequence A124904 A129144 A105022
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KEYWORD
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nonn,tabl
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AUTHOR
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njas, Nov 22 2004
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