Number of nodes in virtual, "optimal", chordal graphs of diameter 5, degree =n+1.

Terms

a(0) =11a(1) =20a(2) =61a(3) =102a(4) =231a(5) =360a(6) =681a(7) =1002a(8) =1683a(9) =2364a(10) =3653a(11) =4942a(12) =7183a(13) =9424a(14) =13073a(15) =16722a(16) =22363a(17) =28004a(18) =36365a(19) =44726a(20) =56695a(21) =68664a(22) =85305a(23) =101946a(24) =124515a(25) =147084a(26) =177045a(27) =207006a(28) =246047a(29) =285088