Partial sums of A064061.

Terms

a(0) =429a(1) =1859a(2) =5291a(3) =12363a(4) =25623a(5) =48879a(6) =87639a(7) =149655a(8) =245586a(9) =389796a(10) =601304a(11) =904904a(12) =1332474a(13) =1924494a(14) =2731794a(15) =3817554a(16) =5259579a(17) =7152873a(18) =9612537a(19) =12777017a(20) =16811729a(21) =21913089a(22) =28312977a(23) =36283665a(24) =46143240a(25) =58261554