A014773 Squares of odd heptagonal numbers.

1, 49, 3025, 6561, 35721, 55225, 162409, 219961, 485809, 613089, 1147041, 1385329, 2325625, 2725801, 4239481, 4862025, 7144929, 8059921, 11336689, 12623809, 17147881, 18896409, 24950025, 27258841, 35153041, 38130625