On the Energies of the Octupole States of Even-Even Nuclei in the Energy Region 228 /less than or equal to/ A /less than or equal to/ 254; OB ENERGIYAKH OKTUPOL'NYKH SOSLOYANII CHETNA CHETNYKH YADER V OBLASTI 228 /less than or equal to/ A /less than or equal to/ 254