



4, 5, 6, 7, 0, 1, 2, 3, 12, 13, 14, 15, 8, 9, 10, 11, 20, 21, 22, 23, 16, 17, 18, 19, 28, 29, 30, 31, 24, 25, 26, 27, 36, 37, 38, 39, 32, 33, 34, 35, 44, 45, 46, 47, 40, 41, 42, 43, 52, 53, 54, 55, 48, 49, 50, 51, 60, 61
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OFFSET

0,1


COMMENTS

A selfinverse permutation of the natural numbers.  Philippe Deléham, Nov 22 2016


REFERENCES

E. R. Berlekamp, J. H. Conway and R. K. Guy, Winning Ways, Academic Press, NY, 2 vols., 1982, see p. 60.
J. H. Conway, On Numbers and Games. Academic Press, NY, 1976, pp. 5153.


LINKS

Table of n, a(n) for n=0..57.
Index entries for sequences related to Nimsums
Index entries for linear recurrences with constant coefficients, signature (2,1,0,1,2,1)


FORMULA

G.f.: [43x4x^4+5x^5]/[(1x)^2(1+x^4)].  Ralf Stephan, Apr 24 2004
a(n) = n + 4(1)^[n/4].  Mitchell Harris, Jan 10 2005


CROSSREFS

Sequence in context: A273777 A023846 A046345 * A174630 A163875 A244586
Adjacent sequences: A004442 A004443 A004444 * A004446 A004447 A004448


KEYWORD

nonn


AUTHOR

N. J. A. Sloane


STATUS

approved



