Number of finite even-length multisets of positive integers whose right half sums to n.

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =10a(5) =13a(6) =26a(7) =31a(8) =55a(9) =73a(10) =112a(11) =140a(12) =233a(13) =276a(14) =405a(15) =539a(16) =750a(17) =931a(18) =1327a(19) =1627a(20) =2259a(21) =2839a(22) =3708a(23) =4624a(24) =6237a(25) =7636a(26) =9823a(27) =12275a(28) =15715a(29) =19227