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A033453
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"INVERT" transform of squares A000290.
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4
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1, 5, 18, 63, 221, 776, 2725, 9569, 33602, 117995, 414345, 1454992, 5109273, 17941453, 63002258, 221235399, 776878533, 2728045592, 9579660701, 33639430153, 118126444802, 414806579603, 1456612858961
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Number of compositions of n+1 whose parts equal to q can be of q^2 kinds. Example: a(1)=5 because we have (2),(2'),(2"),(2'") and (1,1). Row sums of A105495. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Apr 10 2005
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FORMULA
| G.f.: (x+1)/(1-4x+2x^2-x^3).
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MAPLE
| read transforms; [seq(n^2, n=1..50)]; INVERT(%);
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CROSSREFS
| Cf. A105495.
Sequence in context: A113301 A111567 A029869 * A147535 A184309 A051944
Adjacent sequences: A033450 A033451 A033452 * A033454 A033455 A033456
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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