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Search: id:A053439
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| A053439 |
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Expansion of (1+x+2*x^3)/((1-x)*(1-x^2)^2). |
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+0
1
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| 1, 2, 4, 8, 11, 18, 22, 32, 37, 50, 56, 72, 79, 98, 106, 128, 137, 162, 172, 200, 211, 242, 254, 288, 301, 338, 352, 392, 407, 450, 466, 512, 529, 578, 596, 648, 667, 722, 742, 800, 821, 882, 904, 968, 991, 1058, 1082, 1152, 1177, 1250, 1276
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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Even: a(2*n)= 2* n^2 +n +1, odd: a(2*n-1)= 2* n^2. - Frank Ellermann, Feb 11, 2002
a(n)=sum{k=0..n, C(n, mod(k, 2)) } - Paul Barry (pbarry(AT)wit.ie), Jul 24 2003
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CROSSREFS
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Sequence in context: A010068 A120632 A007295 this_sequence A033956 A159693 A053437
Adjacent sequences: A053436 A053437 A053438 this_sequence A053440 A053441 A053442
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Jan 12 2000
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