A069940 (1/2)*((Sum of digits of n)^2 + (Sum of digits^2 of n)).
0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 1, 3, 7, 13, 21, 31, 43, 57, 73, 91, 4, 7, 12, 19, 28, 39, 52, 67, 84, 103, 9, 13, 19, 27, 37, 49, 63, 79, 97, 117, 16, 21, 28, 37, 48, 61, 76, 93, 112, 133, 25, 31, 39, 49, 61, 75, 91, 109, 129, 151, 36, 43, 52, 63, 76, 91, 108, 127
Offset: 0