Number of subsets of Z_n such that every ordered pair of distinct elements has a different sum.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =15a(5) =26a(6) =48a(7) =78a(8) =133a(9) =202a(10) =316a(11) =474a(12) =755a(13) =1054a(14) =1604a(15) =2196a(16) =3305a(17) =4370a(18) =6208a(19) =8228a(20) =11631a(21) =15086a(22) =20912a(23) =26842a(24) =37581a(25) =46626a(26) =64052a(27) =79984a(28) =109635a(29) =133314