a(n) = A007318 * [1, 6, 14, 9, 0, 0, 0, ...].

Terms

a(0) =1a(1) =7a(2) =27a(3) =70a(4) =145a(5) =261a(6) =427a(7) =652a(8) =945a(9) =1315a(10) =1771a(11) =2322a(12) =2977a(13) =3745a(14) =4635a(15) =5656a(16) =6817a(17) =8127a(18) =9595a(19) =11230a(20) =13041a(21) =15037a(22) =17227a(23) =19620a(24) =22225a(25) =25051a(26) =28107a(27) =31402a(28) =34945a(29) =38745