This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A187894 #4 Mar 30 2012 16:52:01 %S A187894 0,1,1,5,13,151,463,2957,9725,261739,896507,6231571,21920539, %T A187894 311583955,1116869179,8066939069,29323723037,1715310801971, %U A187894 6303146700755,46534580965463,172479371522639,2566609537700489,9580228898547889,71737644622567835,269340391562396747,8110742483462690623,30602551916179033519 %N A187894 Numerators of expansion of sqrt(F-1) where F is the g.f. for A000957. %C A187894 The denominators are powers of 2. %D A187894 L. W. Shapiro and C. J. Wang, Generating identities via 2 X 2 matrices, Congressus Numerantium, 205 (2010), 33-46. %e A187894 0, 1, 1, 5/2, 13/2, 151/8, 463/8, 2957/16, 9725/16, 261739/128, 896507/128, ... %Y A187894 Cf. A000957. %K A187894 nonn,frac %O A187894 0,4 %A A187894 _N. J. A. Sloane_, Mar 15 2011