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Search: id:A136660
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| A136660 |
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Unsigned fourth column (k=3) of triangle A136656 divided by 8. |
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+0
4
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| 1, 18, 255, 3465, 47880, 687960, 10372320, 164656800, 2754259200, 48518870400, 899026128000, 17495593315200, 356995102464000, 7625049239808000, 170196434343936000, 3963602854987776000, 96160451873181696000
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Also unsigned third column of triangle A136657 divided by 4.
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REFERENCES
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Ch. A. Charalambides, Enumerative Combinatorics, Chapman & Hall/CRC, Boca Raton, Florida, 2002, Table 8.3, p. 311, with s=-2, k=3 column/8.
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FORMULA
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a(n)= |A136656(n+3,3)|/8, n>=0.
E.g.f.(derived from the one given for the column k=3 under A136656): (2+18*x+3*x^2-12*x^3+3*x^4)/(2*(1-x)^9).
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CROSSREFS
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Cf. A136659 (column k=2), A136661 (column k=4).
Adjacent sequences: A136657 A136658 A136659 this_sequence A136661 A136662 A136663
Sequence in context: A125475 A016175 A062141 this_sequence A078205 A080583 A076693
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KEYWORD
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nonn,easy
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de) Feb 22 2008
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