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Search: id:A046183
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A046183 Octagonal triangular numbers. +0
3
1, 21, 11781, 203841, 113123361, 1957283461, 1086210502741, 18793835590881, 10429793134197921, 180458407386358101, 100146872588357936901, 1732761608929974897121, 961610260163619775927681 (list; graph; listen)
OFFSET

1,2

LINKS

Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.

FORMULA

:a(n+2)=9602*a(n+1)-a(n)+2200, a(n+1)=4801*a(n)+1100+980*(24*a(n)^2+11*a(n)+1)^0.5. G.f.: f(z)=a(1)*z+a(2)*z^2+...= (z+21*z^2+2178*z^3+2178*z^4+21*z^5+z^6)/((1-z^2)*(1-9602*z^2+z^4)) (the numerator is divible by 1+z but it is more symetri" like that) - Richard Choulet (richardchoulet(AT)yahoo.fr), Oct 03 2007

CROSSREFS

Cf. A046181, A046182.

Cf. A046182 A046183.

Sequence in context: A135823 A013726 A048914 this_sequence A115485 A001167 A100414

Adjacent sequences: A046180 A046181 A046182 this_sequence A046184 A046185 A046186

KEYWORD

nonn

AUTHOR

Eric Weisstein (eric(AT)weisstein.com)

EXTENSIONS

More terms from Richard Choulet (richardchoulet(AT)yahoo.fr), Oct 03 2007

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.


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