Partial sums of A301692.

Terms

a(0) =1a(1) =5a(2) =12a(3) =21a(4) =33a(5) =49a(6) =70a(7) =95a(8) =121a(9) =150a(10) =184a(11) =222a(12) =263a(13) =305a(14) =351a(15) =403a(16) =458a(17) =515a(18) =573a(19) =636a(20) =706a(21) =778a(22) =851a(23) =925a(24) =1005a(25) =1093a(26) =1182a(27) =1271a(28) =1361a(29) =1458