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Search: id:A064480
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| A064480 |
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Form a conjugate partition of row with 1+1+1 in first row. all other rows are the union of their parents. n-th row sum is equal to 3*2^(n-1). The largest part of n-th row is A000204(n). a(n) = number of types of piles in n-th row. |
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+0
1
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| 1, 2, 3, 5, 7, 10, 13, 19, 26, 36, 51, 69, 94, 130, 188
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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(first row: 1+1+1 and the other conjugate partition is 3; 2nd row is union of 1+1+1 and 3.) (2nd row: 3+1+1+1 and the other conjugate partition is 4+1+1; 3rd row is union of 3+1+1+1 and 4+1+1.) (3rd row: 4+3+1+1+1+1+1 and the other conjugate partition is 7+2+2+1; 4th row is union of 4+3+1+1+1+1+1 and 7+2+2+1.)
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CROSSREFS
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Cf. A000700, A000701, A000204.
Sequence in context: A005691 A035954 A023192 this_sequence A115024 A167050 A019529
Adjacent sequences: A064477 A064478 A064479 this_sequence A064481 A064482 A064483
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KEYWORD
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easy,nonn
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AUTHOR
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Naohiro Nomoto (n_nomoto(AT)yabumi.com), Feb 14 2002
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