Partial sums of A299259.

Terms

a(0) =1a(1) =6a(2) =19a(3) =45a(4) =90a(5) =159a(6) =257a(7) =390a(8) =563a(9) =781a(10) =1050a(11) =1375a(12) =1761a(13) =2214a(14) =2739a(15) =3341a(16) =4026a(17) =4799a(18) =5665a(19) =6630a(20) =7699a(21) =8877a(22) =10170a(23) =11583a(24) =13121a(25) =14790a(26) =16595a(27) =18541a(28) =20634a(29) =22879