Number of magic labelings with magic sum n of 6th graph shown in link.

Terms

a(0) =1a(1) =17a(2) =137a(3) =707a(4) =2709a(5) =8417a(6) =22408a(7) =53008a(8) =114251a(9) =228431a(10) =429325a(11) =766167a(12) =1308451a(13) =2151643a(14) =3423880a(15) =5293736a(16) =7979133a(17) =11757477a(18) =16977097a(19) =24070067a(20) =33566489a(21) =46110317a(22) =62476800a(23) =83591624a(24) =110551831a(25) =144648595a(26) =187391933a(27) =240537431a(28) =306115063a(29) =386460183