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A115525
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Periodic {1,1,-2,0,1,0,-1,0,0,1,-1,-1}.
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1
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1, 1, -2, 0, 1, 0, -1, 0, 0, 1, -1, -1, 1, 1, -2, 0, 1, 0, -1, 0, 0, 1, -1, -1, 1, 1, -2, 0, 1, 0, -1, 0, 0, 1, -1, -1, 1, 1, -2, 0, 1, 0, -1, 0, 0, 1, -1, -1, 1, 1, -2, 0, 1, 0, -1, 0, 0, 1, -1, -1, 1, 1, -2, 0, 1, 0, -1, 0, 0, 1, -1, -1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| Diagonal sums of number triangle A115524.
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FORMULA
| G.f.: (1+2x-x^3-2x^4-x^5)/(1+x+x^2-x^4-x^5-x^6).
a(n)=(1/792)*{-133*(n mod 12)-[(n+1) mod 12]+131*[(n+2) mod 12]-67*[(n+3) mod 12]-[(n+4) mod 12]-67*[(n+5) mod 12]+65*[(n+6) mod 12]+65*[(n+7) mod 12]-67*[(n+8) mod 12]-133*[(n+9) mod 12]+197*[(n+10) mod 12]-[(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: A070100 A070095 A060951 * A065717 A070092 A123671
Adjacent sequences: A115522 A115523 A115524 * A115526 A115527 A115528
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KEYWORD
| easy,sign
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Jan 25 2006
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