Sum of smallest parts (counted with multiplicity) of all compositions of n.

Terms

a(0) =1a(1) =4a(2) =8a(3) =20a(4) =37a(5) =86a(6) =173a(7) =372a(8) =788a(9) =1680a(10) =3550a(11) =7554a(12) =15994a(13) =33820a(14) =71374a(15) =150376a(16) =316151a(17) =663474a(18) =1389760a(19) =2906116a(20) =6066899a(21) =12645608a(22) =26318870a(23) =54700044a(24) =113536171a(25) =235363832a(26) =487342781a(27) =1007969620a(28) =2082597193a(29) =4298660754