a(n) = the number of squares with at most n digits and first digit 1.

A083379

a(n) = the number of squares with at most n digits and first digit 1.

Terms

    a(0) =1a(1) =2a(2) =7a(3) =20a(4) =62a(5) =193a(6) =608a(7) =1918a(8) =6061a(9) =19160a(10) =60582a(11) =191568a(12) =605782a(13) =1915640a(14) =6057776a(15) =19156359a(16) =60577716a(17) =191563545a(18) =605777108a(19) =1915635402

External references