Squares whose consecutive digits vary by at most 1.

Terms

a(0) =0a(1) =1a(2) =4a(3) =9a(4) =100a(5) =121a(6) =676a(7) =10000a(8) =12100a(9) =12321a(10) =1000000a(11) =1210000a(12) =1232100a(13) =1234321a(14) =100000000a(15) =121000000a(16) =123210000a(17) =123432100a(18) =123454321a(19) =10000000000a(20) =12100000000a(21) =12321000000a(22) =12343210000a(23) =12345432100a(24) =12345654321