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A115953
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Periodic {1,-1,0,0,1,-2,1,0,0,-1,1,-1}.
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1
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1, -1, 0, 0, 1, -2, 1, 0, 0, -1, 1, -1, 1, -1, 0, 0, 1, -2, 1, 0, 0, -1, 1, -1, 1, -1, 0, 0, 1, -2, 1, 0, 0, -1, 1, -1, 1, -1, 0, 0, 1, -2, 1, 0, 0, -1, 1, -1, 1, -1, 0, 0, 1, -2, 1, 0, 0, -1, 1, -1, 1, -1, 0, 0, 1, -2, 1, 0, 0, -1, 1, -1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,6
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COMMENTS
| Diagonal sums of number triangle A115952.
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FORMULA
| G.f.: (1-x^3-x^5)/((1-x^3)(1+x+x^2+x^3))
a(n)=(1/792)*{ - 133*(n mod 12) + 131*[(n + 1) mod 12] - 133*[(n + 2) mod 12] + 65*[(n + 3) mod 12] - [(n + 4) mod 12] + 65*[(n + 5) mod 12] - 199*[(n + 6) mod 12] + 197*[(n + 7) mod 12] - 67*[(n + 8) mod 12] - [(n + 9) mod 12] - 67*[(n + 10) mod 12] + 131*[(n + 11) mod 12]}, with n>=0 - Paolo P. Lava (paoloplava(AT)gmail.com), Jun 11 2007
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CROSSREFS
| Sequence in context: A117201 A060953 A082858 * A204770 A143379 A136567
Adjacent sequences: A115950 A115951 A115952 * A115954 A115955 A115956
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KEYWORD
| easy,sign
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Feb 02 2006
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