Number of magic labelings with magic sum n of 4th graph shown in link.

Terms

a(0) =1a(1) =15a(2) =114a(3) =569a(4) =2138a(5) =6562a(6) =17329a(7) =40765a(8) =87512a(9) =174452a(10) =327137a(11) =582784a(12) =993895a(13) =1632561a(14) =2595510a(15) =4009958a(16) =6040323a(17) =8895861a(18) =12839284a(19) =18196419a(20) =25366968a(21) =34836428a(22) =47189231a(23) =63123163a(24) =83465122a(25) =109188274a(26) =141430667a(27) =181515362a(28) =230972141a(29) =291560851