Self-convolution square root of the even bisection of A274965.

Terms

a(0) =1a(1) =1a(2) =4a(3) =19a(4) =92a(5) =446a(6) =2150a(7) =10280a(8) =48761a(9) =229558a(10) =1073278a(11) =4986624a(12) =23037102a(13) =105877968a(14) =484337300a(15) =2206188412a(16) =10010589904a(17) =45264063504a(18) =204016241794a(19) =916898737038