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Search: id:A081407
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| A081407 |
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4-th order non-linear ("factorial") recursion: a(0)=a(1)=a(2)=a(3)=1; a(n)=(n+1).a(n-4). |
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+0
1
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| 1, 1, 1, 1, 5, 6, 7, 8, 45, 60, 77, 96, 585, 840, 1155, 1536, 9945, 15120, 21945, 30720, 208845, 332640, 504735, 737280, 5221125, 8648640, 13627845, 20643840, 151412625, 259459200, 422463195, 660602880, 4996616625, 8821612800
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OFFSET
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0,5
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EXAMPLE
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Following sequences are interleaved: A007696: {5,45,585,..}; A000404: {6,60,840,..} A034176: {7,77,1155,..}; A034177: {8,96,1536,..}
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MATHEMATICA
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f[x_] := (x+1)*f[x-4] f[0]=1; f[1]=1; f[2]=1; f[3]=1; Table[f[w], {w, 0, 40}]
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CROSSREFS
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Cf. A007696, A000404, A034176, A034177, A081405-A081407.
Sequence in context: A080703 A047575 A014097 this_sequence A066263 A089192 A132829
Adjacent sequences: A081404 A081405 A081406 this_sequence A081408 A081409 A081410
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Apr 01 2003
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