Centered square number



A centered square number is a number which is the sum of two consecutive square numbers.

The centered square numbers are: 1, 5, 13, 25, 41, 61, 85, 113, 145, 181, 221, 265, 313, 365, 421, 481, 545, 613, 685, 761, 841, 925, … (sequence A001844 in OEIS).