Partial sums of A065641.

Terms

a(0) =1a(1) =11a(2) =71a(3) =161a(4) =262a(5) =382a(6) =762a(7) =1212a(8) =1717a(9) =2524a(10) =3544a(11) =4614a(12) =5917a(13) =7367a(14) =11177a(15) =21197a(16) =31601a(17) =42161a(18) =58217a(19) =74417a(20) =92505a(21) =112827a(22) =133407a(23) =169197a(24) =248197a(25) =328285a(26) =419162a(27) =662862a(28) =942371a(29) =1273203