OFFSET
0,4
LINKS
É. Czabarka, R. Flórez, L. Junes, A Discrete Convolution on the Generalized Hosoya Triangle, Journal of Integer Sequences, 18 (2015), #15.1.6.
FORMULA
EXAMPLE
a(4)=5 because in 1110, 1111, 110'1, 1010, 1011, 0'110, 0'111 and 0'10'1 one has altogether five 0's in odd position (marked by ').
MAPLE
g:=z*(1-z^2)/(1-z-z^2)^2/(1+z-z^2): gser:=series(g, z=0, 43): seq(coeff(gser, z, n), n=0..40);
CROSSREFS
KEYWORD
nonn
AUTHOR
Emeric Deutsch, May 13 2007
STATUS
approved