Sums of members of groups in A076062.

Terms

a(0) =2a(1) =6a(2) =15a(3) =35a(4) =66a(5) =117a(6) =170a(7) =266a(8) =368a(9) =522a(10) =682a(11) =851a(12) =1107a(13) =1376a(14) =1692a(15) =2067a(16) =2478a(17) =2928a(18) =3417a(19) =4047a(20) =4672a(21) =5293a(22) =6059a(23) =6942a(24) =7857a(25) =8787a(26) =9888a(27) =11021a(28) =12208a(29) =13447