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A054076
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Permutation of N: a(n)+C(k,2), where a=A054073 and k=Floor((1+sqrt(8n-3))/2).
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4
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1, 2, 3, 6, 4, 5, 9, 7, 10, 8, 15, 13, 11, 14, 12, 20, 18, 16, 21, 19, 17, 26, 24, 22, 27, 25, 23, 28, 33, 31, 36, 29, 34, 32, 30, 35, 41, 39, 44, 37, 42, 40, 45, 38, 43, 50, 55, 48, 53, 46, 51, 49, 54, 47, 52, 60, 65, 58, 63, 56, 61, 66, 59
(list; graph; refs; listen; history; internal format)
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