Number of 1-dimensional sandpiles with n grains.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =5a(7) =8a(8) =13a(9) =22a(10) =36a(11) =60a(12) =100a(13) =166a(14) =277a(15) =461a(16) =769a(17) =1282a(18) =2137a(19) =3565a(20) =5945a(21) =9916a(22) =16540a(23) =27589a(24) =46022a(25) =76769a(26) =128062a(27) =213628a(28) =356366a(29) =594483