Self-convolution of 1 2 3 5 7 11 15 22 30 42 56 77 ... (A000041).

Terms

a(0) =1a(1) =4a(2) =10a(3) =22a(4) =43a(5) =80a(6) =141a(7) =240a(8) =397a(9) =640a(10) =1011a(11) =1568a(12) =2395a(13) =3604a(14) =5360a(15) =7876a(16) =11460a(17) =16510a(18) =23588a(19) =33418a(20) =47006a(21) =65640a(22) =91085a(23) =125596a(24) =172215a(25) =234820a(26) =318579a(27) =430060a(28) =577920a(29) =773130