Bond series for second parallel moment of hexagonal net.

Terms

a(0) =1a(1) =8a(2) =18a(3) =64a(4) =100a(5) =288a(6) =376a(7) =999a(8) =1152a(9) =3004a(10) =3032a(11) =8218a(12) =7202a(13) =21144a(14) =15289a(15) =52219a(16) =29158a(17) =125656a(18) =46040a(19) =298334a(20) =47253a(21) =705343a(22) =-49854a(23) =1674042a(24) =-509904a(25) =4009394a(26) =-2159554a(27) =9722280a(28) =-7350701a(29) =23906836