a(n) = (n^11 - n)/11.

Terms

a(0) =0a(1) =0a(2) =186a(3) =16104a(4) =381300a(5) =4438920a(6) =32981550a(7) =179756976a(8) =780903144a(9) =2852823600a(10) =9090909090a(11) =25937424600a(12) =67546215516a(13) =162923672184a(14) =368142288150a(15) =786341441760