1,2

a(n)/a(n-1) tends to 1 + sqrt(2).

a(n) = 2*A000129(n) + A000129(n-1) - n; where A000129 = the Pell sequence. a(n) = A000129(n+1) - n.

a(5) = 65 = 2*A000129(5) + A000129(4) - 5 = 2*29 + 12 - 5.

a(5) = 65 = A000129(6) - 5 = 70 - 5.

Cf. A000129.

Sequence in context: A065971 A096260 A002064 this_sequence A096322 A058396 A006809

Adjacent sequences: A129586 A129587 A129588 this_sequence A129590 A129591 A129592

nonn

Gary W. Adamson (qntmpkt(AT)yahoo.com), Sep 19 2007