Number of sets of exactly n positive integers <= n+7 having a square element sum.

Terms

a(0) =1a(1) =2a(2) =6a(3) =15a(4) =34a(5) =71a(6) =134a(7) =238a(8) =405a(9) =660a(10) =1030a(11) =1559a(12) =2310a(13) =3336a(14) =4691a(15) =6500a(16) =8886a(17) =11899a(18) =15709a(19) =20584a(20) =26624a(21) =33926a(22) =42974a(23) =54080a(24) =67172a(25) =82800a(26) =101787a(27) =124031a(28) =149660a(29) =180251