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A302178
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The number of 3D walks of semilength n in a quadrant returning to the origin.
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0
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1, 4, 40, 570, 9898, 195216, 4209084, 96941130, 2349133930, 59272544760, 1545550116240, 41416083787260, 1135679731004700, 31760915181412800, 903492759037272480, 26086451983000501410, 763124703525758894490, 22585374873810849150600, 675419388009799152812400
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OFFSET
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0,2
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LINKS
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Nachum Dershowitz, Touchard's Drunkard, Journal of Integer Sequences, Vol. 20 (2017), #17.1.5. The sequence is type aab in Table 3.
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FORMULA
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CROSSREFS
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Cf. A000108, A000984, A002212, A002896, A005572, A026375, A064037, A081671, A138547, A145847, A145867, A150500, A202814.
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KEYWORD
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nonn,walk
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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