T(2n+6,n), array T as in A055794.

Terms

a(0) =1a(1) =8a(2) =37a(3) =130a(4) =385a(5) =1012a(6) =2431a(7) =5434a(8) =11440a(9) =22880a(10) =43758a(11) =80444a(12) =142766a(13) =245480a(14) =410210a(15) =667964a(16) =1062347a(17) =1653608a(18) =2523675a(19) =3782350a(20) =5574855a(21) =8090940a(22) =11575785a(23) =16342950a(24) =22789650a(25) =31414656a(26) =42839148a(27) =57830872