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A090278
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"Plain Bob Minimus" in bell-ringing is a sequence of permutations p_1=(1,2,3,4), p_2=(2,1,4,3), .. which runs through all permutations of {1,2,3,4} with period 24; sequence gives number in position 2 of n-th permutation.
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1
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2, 1, 4, 2, 3, 4, 1, 3, 3, 1, 2, 3, 4, 2, 1, 4, 4, 1, 3, 4, 2, 3, 1, 2, 2, 1, 4, 2, 3, 4, 1, 3, 3, 1, 2, 3, 4, 2, 1, 4, 4, 1, 3, 4, 2, 3, 1, 2, 2, 1, 4, 2, 3, 4, 1, 3, 3, 1, 2, 3, 4, 2, 1, 4, 4, 1, 3, 4, 2, 3, 1, 2, 2, 1, 4, 2, 3, 4, 1, 3, 3, 1, 2, 3, 4, 2, 1, 4, 4, 1, 3, 4, 2, 3, 1, 2, 2, 1, 4
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| R. Bailey, Change Ringing Resources
David Joyner, Application: Bell Ringing
Index entries for sequences related to bell ringing
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FORMULA
| Period 24.
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MAPLE
| ring:= proc(k) option remember; local l, a, b, c, swap, h; l:= [1, 2, 3, 4]; swap:= proc(i, j) h:=l[i]; l[i]:=l[j]; l[j]:=h end; a:= proc() swap(1, 2); swap(3, 4); l[k] end; b:= proc() swap(2, 3); l[k] end; c:= proc() swap(3, 4); l[k] end; [l[k], seq ([seq ([a(), b()][], j=1..3), a(), c()][], i=1..3)] end: a:= n-> ring(2)[modp(n-1, 24)+1]: seq (a(n), n=1..99); [From Alois P. Heinz (heinz(AT)hs-heilbronn.de), Aug 19 2008]
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CROSSREFS
| Cf. A090277-A090284.
Sequence in context: A135941 A036998 A121464 * A153279 A082908 A086449
Adjacent sequences: A090275 A090276 A090277 * A090279 A090280 A090281
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jan 24 2004
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