p-INVERT of the squares (A000290), where p(S) = 1 - S^3.

Terms

a(0) =0a(1) =0a(2) =1a(3) =12a(4) =75a(5) =329a(6) =1158a(7) =3606a(8) =10971a(9) =35601a(10) =126168a(11) =467541a(12) =1722714a(13) =6173070a(14) =21563906a(15) =74452230a(16) =257613930a(17) =899546303a(18) =3166966692a(19) =11185908147a(20) =39459021883a(21) =138761604786a(22) =486746839758