%I #9 Jan 18 2020 07:21:58
%S 1,3,2,-50,-43,535,487,-4983,-4654,43174,40919,-357743,-342287,
%T 2875755,2769818,-22615130,-21889027,174913543,169936759,-1335320799,
%U -1301209414,10087636558,9853833647,-75551725535,-73949216543,561774270675,550790510642,-4151593378178
%N Hankel transform of A331473.
%F G.f.: (1 + 3x + 16x^2 - 8x^3 + 36x^4 - 12x^5 + x^6 - x^7)/(1 + 7x^2 + x^4)^2 (conjecture).
%Y Cf. A331473.
%K sign
%O 0,2
%A _Paul Barry_, Jan 17 2020