Partial sums of A234275.

Terms

a(0) =1a(1) =5a(2) =21a(3) =45a(4) =77a(5) =117a(6) =165a(7) =221a(8) =285a(9) =357a(10) =437a(11) =525a(12) =621a(13) =725a(14) =837a(15) =957a(16) =1085a(17) =1221a(18) =1365a(19) =1517a(20) =1677a(21) =1845a(22) =2021a(23) =2205a(24) =2397a(25) =2597a(26) =2805a(27) =3021a(28) =3245a(29) =3477