OFFSET
0,2
FORMULA
G.f.: (1 + 3x + 16x^2 - 8x^3 + 36x^4 - 12x^5 + x^6 - x^7)/(1 + 7x^2 + x^4)^2 (conjecture).
CROSSREFS
KEYWORD
sign
AUTHOR
Paul Barry, Jan 17 2020
STATUS
approved