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A076604 a(1)=11, a(n_even)=(a(n-1)^2-1)/2; a(n_odd)=a(n-1)+1. 4
11, 60, 61, 1860, 1861, 1731660, 1731661, 1499324909460, 1499324909461, 1123987592065117923655260, 1123987592065117923655261, 631674053558170970207436821512098200057586489060 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

{11, 60, 61}, {61, 1860, 1861}, {1861, 1731660, 1731661}... are sides {a<b<c} of the right triangles, with hypotenuse c=b+1.

LINKS

Table of n, a(n) for n=1..12.

CROSSREFS

Sequence in context: A082884 A193230 A077036 * A076676 A044149 A044530

Adjacent sequences:  A076601 A076602 A076603 * A076605 A076606 A076607

KEYWORD

easy,nonn

AUTHOR

Zak Seidov, Oct 21 2002

EXTENSIONS

a(12) from Lars Blomberg, Oct 08 2008

STATUS

approved

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Last modified July 5 03:05 EDT 2020. Contains 335457 sequences. (Running on oeis4.)