Fourth column (r=3) of FS(3) staircase array A062745.

Terms

a(0) =3a(1) =9a(2) =19a(3) =34a(4) =55a(5) =83a(6) =119a(7) =164a(8) =219a(9) =285a(10) =363a(11) =454a(12) =559a(13) =679a(14) =815a(15) =968a(16) =1139a(17) =1329a(18) =1539a(19) =1770a(20) =2023a(21) =2299a(22) =2599a(23) =2924a(24) =3275a(25) =3653a(26) =4059a(27) =4494a(28) =4959a(29) =5455