

A065187


"Greedy Dragons" permutation of the natural numbers, inverse of A065186.


5



1, 4, 2, 5, 3, 6, 9, 7, 10, 8, 11, 14, 12, 15, 13, 16, 19, 17, 20, 18, 21, 24, 22, 25, 23, 26, 29, 27, 30, 28, 31, 34, 32, 35, 33, 36, 39, 37, 40, 38, 41, 44, 42, 45, 43, 46, 49, 47, 50, 48, 51, 54, 52, 55, 53, 56, 59, 57, 60, 58, 61, 64, 62, 65, 63, 66, 69, 67, 70, 68, 71, 74
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OFFSET

1,2


LINKS

Michael De Vlieger, Table of n, a(n) for n = 1..10000
Index entries for sequences that are permutations of the natural numbers


FORMULA

From Chai Wah Wu, Oct 23 2017: (Start)
a(1) = 1, a(2) = 4, a(3) = 2, a(4) = 5, a(5) = 3; for n > 5, a(n) = a(n5) + 5.
a(n) = a(n1) + a(n5)  a(n6) for n > 6.
G.f.: x*(2*x^5  2*x^4 + 3*x^3  2*x^2 + 3*x + 1)/((x  1)*(x^5  1)). (End)


MATHEMATICA

Rest@ CoefficientList[Series[x (2 x^5  2 x^4 + 3 x^3  2 x^2 + 3 x + 1)/((x  1) (x^5  1)), {x, 0, 72}], x] (* Michael De Vlieger, Oct 23 2017 *)


CROSSREFS

Sequence in context: A123152 A243855 A267185 * A185511 A199855 A127914
Adjacent sequences: A065184 A065185 A065186 * A065188 A065189 A065190


KEYWORD

nonn


AUTHOR

Antti Karttunen, Oct 19 2001


STATUS

approved



