%I A013979
%S A013979 1,0,1,1,2,2,4,5,8,11,17,24,36,52,77,112,165,241,354,518,
%T A013979 760,1113,1632,2391,3505,5136,7528,11032,16169,23696,34729,
%U A013979 50897,74594,109322,160220,234813,344136,504355,739169
%N A013979 Expansion of 1/(1-x^2-x^3-x^4).
%C A013979 For n>0, number of ordered partitions of n into 2's, 3's and 4's. - Len 
               Smiley (smiley(AT)math.uaa.alaska.edu), May 08 2001
%C A013979 Diagonal sums of trinomial triangle A071675 (Riordan array (1, x(1+x+x^2))). 
               - Paul Barry (pbarry(AT)wit.ie), Feb 15 2005
%D A013979 C. K. Fan, A Hecke algebra quotient and some combinatorial applications. 
               J. Algebraic Combin. 5 (1996), no. 3, 175-189.
%D A013979 C. K. Fan, Structure of a Hecke algebra quotient. J. Amer. Math. Soc. 
               10 (1997), no. 1, 139-167. [Page 156, f^0_n.]
%F A013979 a(n)=sum{k=0..floor(n/2), sum{i=0..floor(n/2), C(k, 2i+3k-n)C(2i+3k-n, 
               i)}}; - Paul Barry (pbarry(AT)wit.ie), Feb 15 2005
%F A013979 a(n) = a(n-4) + a(n-3) + a(n-2). - Jon Schoenfield (jonscho(AT)hiwaay.net), 
               Aug 07 2006
%Y A013979 Cf. A060945 (Ordered partitions into 1's, 2's and 4's), A107458.
%Y A013979 First differences of A023435.
%Y A013979 Sequence in context: A109434 A089299 A017910 this_sequence A107458 A060280 
               A006206
%Y A013979 Adjacent sequences: A013976 A013977 A013978 this_sequence A013980 A013981 
               A013982
%K A013979 nonn
%O A013979 0,5
%A A013979 N. J. A. Sloane (njas(AT)research.att.com).