OFFSET
0,4
LINKS
Dmitry Efimov, Determinants of generalized binary band matrices, arXiv:1702.05655 [math.RA], 2017.
FORMULA
a(n) = (A000295(n) + (-1)^n * (n-1))/2, n > 0.
a(n) = 2^(n-1) - 1 for odd n.
CROSSREFS
KEYWORD
nonn
AUTHOR
Eric M. Schmidt, Oct 09 2017
STATUS
approved