Partial sums of A064059.

Terms

a(0) =132a(1) =561a(2) =1562a(3) =3564a(4) =7204a(5) =13392a(6) =23388a(7) =38892a(8) =62148a(9) =96063a(10) =144342a(11) =211640a(12) =303732a(13) =427702a(14) =592152a(15) =807432a(16) =1085892a(17) =1442157a(18) =1893426a(19) =2459796a(20) =3164612a(21) =4034844a(22) =5101492a(23) =6400020a(24) =7970820a(25) =9859707a(26) =12118446a(27) =14805312a(28) =17985684