1,1

a(n)=A001248(n+1)+A001248(n)=A000040(n+1)^2+A000040(n)^2;

a(n)=A048851(n+1);

together with A069482(n) and A069486(n) a Pythagorean triangle is formed with area = A069487(n).

Cf. A069485.

Cf. A075892.

Sequence in context: A093100 A081271 A081752 this_sequence A089113 A067430 A082214

Adjacent sequences: A069481 A069482 A069483 this_sequence A069485 A069486 A069487

nonn

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 29 2002