Partial sums of the ziggurat sequence A347186.

Terms

a(0) =1a(1) =5a(2) =11a(3) =27a(4) =39a(5) =76a(6) =96a(7) =160a(8) =196a(9) =286a(10) =328a(11) =489a(12) =545a(13) =701a(14) =808a(15) =1064a(16) =1154a(17) =1488a(18) =1598a(19) =2006a(20) =2208a(21) =2550a(22) =2706a(23) =3403a(24) =3610a(25) =4072a(26) =4384a(27) =5169a(28) =5409a(29) =6385