4th diagonal of triangle in A059317.

Terms

a(0) =0a(1) =0a(2) =0a(3) =2a(4) =9a(5) =22a(6) =42a(7) =70a(8) =107a(9) =154a(10) =212a(11) =282a(12) =365a(13) =462a(14) =574a(15) =702a(16) =847a(17) =1010a(18) =1192a(19) =1394a(20) =1617a(21) =1862a(22) =2130a(23) =2422a(24) =2739a(25) =3082a(26) =3452a(27) =3850a(28) =4277a(29) =4734