Partial sums of A080180.

Terms

a(0) =1a(1) =3a(2) =8a(3) =15a(4) =25a(5) =40a(6) =57a(7) =77a(8) =104a(9) =133a(10) =169a(11) =218a(12) =269a(13) =589a(14) =928a(15) =1269a(16) =1613a(17) =3570a(18) =5529a(19) =7491a(20) =9456a(21) =11423a(22) =24813a(23) =38206a(24) =51601a(25) =65007a(26) =78416a(27) =91827a(28) =105241a(29) =118674