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Search: id:A086781
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| A086781 |
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a(n) is the number of terms in the expansion of (x-y)*(x^2-y^2)*(x^3-y^3)*...*(x^n-y^n). |
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2
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| 2, 4, 6, 7, 12, 14, 18, 25, 32, 36, 42, 53, 68, 64, 84, 97, 108, 126, 146, 161, 170, 192, 208, 229, 246, 274, 300, 333, 348, 372, 400, 427, 468, 492, 526, 561, 602, 626, 644, 691, 736, 772, 826, 869, 902, 930, 974, 1017, 1062, 1120
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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In the definition one can take y=1. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 01 2008
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MAPLE
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a:=proc(n) options operator, arrow: nops(expand(product(x^j-y^j, j=1..n))) end proc: seq(a(n), n=1..50); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 01 2008
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CROSSREFS
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Cf. A000124.
Sequence in context: A051730 A070317 A138398 this_sequence A050053 A084591 A088758
Adjacent sequences: A086778 A086779 A086780 this_sequence A086782 A086783 A086784
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KEYWORD
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nonn
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AUTHOR
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Yuval Dekel (dekelyuval(AT)hotmail.com), Aug 03 2003
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 01 2008
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