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A064660
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Form a conjugate partition of row with 1 in first row. all other rows are the union of their parents. n-th row sum is equal to 2^(n-1). The largest part of n-th row is A000045(n). a(n) = number of types of piles in n-th row.
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1, 1, 2, 3, 4, 6, 8, 11, 15, 22, 30, 39, 53, 75, 106, 151
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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EXAMPLE
| (first row: 1 and the other conjugate partition is 1; 2nd row is union of 1 and 1.) (2nd row: 1+1 and the other conjugate partition is 2; 3rd row is union of 1+1 and 2.) (3rd row: 2+1+1 and the other conjugate partition is 3+1; 4th row is union of 2+1+1 and 3+1.)
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CROSSREFS
| Cf. A000700, A000701, A000045.
Sequence in context: A064323 A003411 A034081 * A066806 A057048 A017911
Adjacent sequences: A064657 A064658 A064659 * A064661 A064662 A064663
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KEYWORD
| easy,nonn
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AUTHOR
| Naohiro Nomoto (n_nomoto(AT)yabumi.com), Feb 14 2002
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