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Search: id:A077937
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| A077937 |
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Expansion of 1/(1-2*x-2*x^2+2*x^3). |
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+0
7
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| 1, 2, 6, 14, 36, 88, 220, 544, 1352, 3352, 8320, 20640, 51216, 127072, 315296, 782304, 1941056, 4816128, 11949760, 29649664, 73566592, 182532992, 452899840, 1123732480, 2788198656, 6918062592, 17165057536, 42589842944, 105673675776, 262196922368
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OFFSET
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0,2
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COMMENT
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Form the graph with matrix A=[1,1,1,1;1,0,0,0;1,0,0,0;1,0,0,1]. Then the sequence 0,1,2,6,.. counts walks of length n between the degree 5 vertex and the degree 3 vertex. - Paul Barry (pbarry(AT)wit.ie), Oct 02 2004
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CROSSREFS
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Cf. A052528, A052987.
Sequence in context: A025257 A110152 A017922 this_sequence A077981 A006653 A144530
Adjacent sequences: A077934 A077935 A077936 this_sequence A077938 A077939 A077940
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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), Nov 17 2002
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