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A179977
Inverse permutation to A108971.
3
1, 2, 3, 4, 5, 6, 7, 8, 9, 17, 16, 15, 14, 13, 12, 11, 10, 25, 26, 18, 19, 20, 21, 22, 23, 24, 27, 28, 29, 37, 36, 35, 34, 33, 32, 31, 30, 45, 46, 38, 39, 40, 41, 42, 43, 44, 47, 48, 49, 57, 56, 55, 54, 53, 52, 51, 50, 65, 66, 58, 59, 60, 61, 62, 63, 64, 67, 68, 69, 77, 76, 75
OFFSET
1,2
COMMENTS
a(A108971(n)) = A108971(a(n)) = n;
a(A179978(n)) = A179978(a(n)) = A108971(n).
CROSSREFS
Sequence in context: A133504 A335492 A108971 * A326298 A372281 A124359
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Aug 04 2010
STATUS
approved