%I A049284
%S A049284 0,0,0,1,1,2,4,7,13,24,43,78,140,251,452,812,1457,2617,4697,8428,
%T A049284 15126,27142,48700,87384,156787,281307,504723,905562,1624731,2915039,
%U A049284 5230040,9383505,16835453,30205347,54192931,97230224,174445475
%N A049284 Restricted partitions.
%D A049284 Even, Shimon; Lempel, Abraham; Generation and enumeration of all solutions 
               of the characteristic sum condition. Information and Control 21 (1972), 
               476-482.
%D A049284 Minc, H.; A problem in partitions: Enumeration of elements of a given 
               degree in the free commutative entropic cyclic groupoid. Proc. Edinburgh 
               Math. Soc. (2) 11 1958/1959 223-224.
%p A049284 v := proc(c,d) option remember; local i; if d < 0 or c < 0 then 0 elif 
               d = c then 1 else add(v(i,d-c),i=1..2*c); fi; end; [ seq(v(4,n), 
               n=1..50) ];
%Y A049284 Cf. A002572, A002573, A002574, A049285.
%Y A049284 Sequence in context: A069765 A090427 A006745 this_sequence A049285 A002843 
               A128742
%Y A049284 Adjacent sequences: A049281 A049282 A049283 this_sequence A049285 A049286 
               A049287
%K A049284 nonn,easy
%O A049284 1,6
%A A049284 N. J. A. Sloane (njas(AT)research.att.com), Michael Somos