Number of magic labelings with magic sum n of first graph shown in link.

Terms

a(0) =1a(1) =9a(2) =43a(3) =143a(4) =379a(5) =859a(6) =1738a(7) =3226a(8) =5597a(9) =9197a(10) =14453a(11) =21881a(12) =32095a(13) =45815a(14) =63876a(15) =87236a(16) =116985a(17) =154353a(18) =200719a(19) =257619a(20) =326755a(21) =410003a(22) =509422a(23) =627262a(24) =765973a(25) =928213a(26) =1116857a(27) =1335005a(28) =1585991a(29) =1873391