Number of palindromic squares with at most n digits.

Terms

a(0) =4a(1) =4a(2) =7a(3) =7a(4) =14a(5) =15a(6) =20a(7) =20a(8) =31a(9) =31a(10) =36a(11) =37a(12) =56a(13) =56a(14) =69a(15) =70a(16) =95a(17) =95a(18) =113a(19) =113a(20) =161a(21) =162a(22) =193a(23) =193a(24) =263a(25) =264a(26) =308a(27) =310a(28) =415a(29) =415