6th diagonal of triangle in A059317.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =3a(5) =22a(6) =82a(7) =218a(8) =476a(9) =914a(10) =1603a(11) =2628a(12) =4089a(13) =6102a(14) =8800a(15) =12334a(16) =16874a(17) =22610a(18) =29753a(19) =38536a(20) =49215a(21) =62070a(22) =77406a(23) =95554a(24) =116872a(25) =141746a(26) =170591a(27) =203852a(28) =242005a(29) =285558