Wiener number of n-hexagonal triangle.

Terms

a(0) =0a(1) =27a(2) =210a(3) =822a(4) =2328a(5) =5433a(6) =11130a(7) =20748a(8) =36000a(9) =59031a(10) =92466a(11) =139458a(12) =203736a(13) =289653a(14) =402234a(15) =547224a(16) =731136a(17) =961299a(18) =1245906a(19) =1594062a(20) =2015832a(21) =2522289a(22) =3125562a(23) =3838884a(24) =4676640a(25) =5654415a(26) =6789042a(27) =8098650a(28) =9602712a(29) =11322093