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6, 7, 8, 0, 1, 2, 3, 4, 5, 15, 16, 17, 9, 10, 11, 12, 13, 14, 24, 25, 26, 18, 19, 20, 21, 22, 23, 33, 34, 35, 27, 28, 29, 30, 31, 32, 42, 43, 44, 36, 37, 38, 39, 40, 41, 51, 52, 53, 45, 46, 47, 48, 49, 50, 60, 61, 62, 54
(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)= -4 + Sum_{k=0..n}{(1/36)*(-35*(k mod 9)+((k+1) mod 9)+((k+2) mod 9)+((k+3) mod 9)+((k+4) mod 9)-35*((k+5) mod 9)+37*((k+6) mod 9)+((k+7) mod 9)+37*((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: A021600 A205867 A046256 * A113786 A004487 A010500
Adjacent sequences: A004492 A004493 A004494 * A004496 A004497 A004498
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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