Bond series for second perpendicular moment of hexagonal net.

Terms

a(0) =2a(1) =2a(2) =8a(3) =8a(4) =24a(5) =24a(6) =64a(7) =60a(8) =156a(9) =134a(10) =360a(11) =274a(12) =800a(13) =512a(14) =1742a(15) =866a(16) =3736a(17) =1226a(18) =8018a(19) =1092a(20) =17236a(21) =-1304a(22) =37564a(23) =-11178a(24) =82990a(25) =-43222a(26) =187006a(27) =-136760a(28) =429010a(29) =-395302