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8, 6, 7, 2, 0, 1, 5, 3, 4, 17, 15, 16, 11, 9, 10, 14, 12, 13, 26, 24, 25, 20, 18, 19, 23, 21, 22, 35, 33, 34, 29, 27, 28, 32, 30, 31, 44, 42, 43, 38, 36, 37, 41, 39, 40, 53, 51, 52, 47, 45, 46, 50, 48, 49, 62, 60, 61, 56
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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FORMULA
| Tersum m + n: write m and n in base 3 and add mod 3 with no carries, e.g. 5 + 8 = "21" + "22" = "10" = 1.
a(n)= -5 + Sum_{k=0..n}{(1/36)*(-47*(k mod 9)-11*((k+1) mod 9)+25*((k+2) mod 9)-11*((k+3) mod 9)-11*((k+4) mod 9)-11*((k+5) mod 9)+25*((k+6) mod 9)-11*((k+7) mod 9)+61*((k+8) mod 9)},with n>=0 - Paolo P. Lava (paoloplava(AT)gmail.com), Dec 03 2007
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CROSSREFS
| Sequence in context: A181048 A199873 A153791 * A091899 A104175 A019792
Adjacent sequences: A004494 A004495 A004496 * A004498 A004499 A004500
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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