Square root of floor[A055859(n)/7].

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =3a(5) =6a(6) =17a(7) =48a(8) =96a(9) =271a(10) =765a(11) =1530a(12) =4319a(13) =12192a(14) =24384a(15) =68833a(16) =194307a(17) =388614a(18) =1097009a(19) =3096720a(20) =6193440a(21) =17483311a(22) =49353213a(23) =98706426a(24) =278635967a(25) =786554688a(26) =1573109376a(27) =4440692161a(28) =12535521795a(29) =25071043590