
0, 2, 1, 3, 8, 9, 7, 6, 4, 5, 15, 11, 14, 13, 12, 10, 31, 32, 30, 29, 33, 35, 34, 28, 27, 26, 25, 24, 23, 19, 18, 16, 17, 20, 22, 21, 63, 62, 59, 58, 60, 61, 42, 44, 43, 47, 46, 45, 57, 55, 56, 51, 54, 53, 52, 49, 50, 48, 39, 38, 40, 41, 37, 36, 121, 122, 120
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OFFSET

0,2


COMMENTS

This sequence is a selfinverse permutation of the nonnegative integers.


LINKS



FORMULA



EXAMPLE

The curve (A334474, A334475) begins as follows on a hexagonal lattice:
+
/5\
/ \
+4 +6
\ \
\ \
+ 3+ +7
/1\ / /
/ \ / /
+ + ++
0 2 8 9
 so a(0) = 0,
a(1) = 2,
a(3) = 3,
a(4) = 8,
a(5) = 9,
a(6) = 7.


PROG

(PARI) See Links section.


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved

