a(n) is root of square starting with digit 6: first term of runs.

Terms

a(0) =8a(1) =25a(2) =78a(3) =245a(4) =775a(5) =2450a(6) =7746a(7) =24495a(8) =77460a(9) =244949a(10) =774597a(11) =2449490a(12) =7745967a(13) =24494898a(14) =77459667a(15) =244948975a(16) =774596670a(17) =2449489743a(18) =7745966693a(19) =24494897428a(20) =77459666925a(21) =244948974279a(22) =774596669242