Self-convolution square of A090845.

Terms

a(0) =1a(1) =2a(2) =5a(3) =10a(4) =20a(5) =40a(6) =67a(7) =126a(8) =203a(9) =354a(10) =571a(11) =908a(12) =1486a(13) =2250a(14) =3586a(15) =5322a(16) =8186a(17) =12234a(18) =17976a(19) =26970a(20) =38435a(21) =57024a(22) =80805a(23) =116376a(24) =165914a(25) =232352a(26) =332196a(27) =456154a(28) =645469a(29) =885826