Update sloane_functions.py

using Partitions

Author: fchapoton

src/sage/combinat/sloane_functions.py

@@ -600,10 +600,8 @@ def _eval(self, n):
             sage: [sloane.A000008._eval(n) for n in range(14)]
             [1, 1, 2, 2, 3, 4, 5, 6, 7, 8, 11, 12, 15, 16]
         """
-        from sage.rings.lazy_series_ring import LazyPowerSeriesRing
-        x = LazyPowerSeriesRing(ZZ, 'x').gen()
-        p = 1/((1-x)*(1-x**2)*(1-x**5)*(1-x**10))
-        return ZZ(p.coefficient(n))
+        from sage.combinat.partition import Partitions
+        return Partitions(n, parts_in=[1, 2, 5, 10]).cardinality()
 
 
 class A000009(SloaneSequence):