0,3

Table of n, a(n) for n=0..84.

Jeffrey Shallit, Lukas Spiegelhofer, Continuants, run lengths, and Barry's modified Pascal triangle, arXiv:1710.06203 [math.CO], 2017.

a(n) = sum{k=0..floor(n/2), mod(sum{j=0..n-2k, C(k, j) C(n-2k, j) (1+(-1)^j)/2}, 2)}. (corrected by Jeffrey Shallit, May 18 2016)

Sequence in context: A116458 A093875 A266193 * A321318 A270362 A196383

Adjacent sequences: A114211 A114212 A114213 * A114215 A114216 A114217

easy,nonn

Paul Barry, Nov 17 2005

approved