A031265 a(n)=(# 1's)-(# 0's) in first n terms of A031253.

1, 1, 2, 1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 4, 4, 4, 5, 4, 3, 4, 3, 3, 4, 3, 3, 4, 5, 6, 7, 8, 8, 9, 9, 8, 9, 9, 9, 10, 10, 10, 11, 11, 12, 13, 13, 13, 14, 14, 13, 14, 14, 14, 15, 15, 15, 15, 14, 15, 15, 14, 14, 14, 15, 14, 14, 15, 15, 15, 16

Offset: 1

Author

Clark Kimberling

Keywords

• nonn

Programs

Mathematica

Accumulate[Flatten[Table[IntegerDigits[2n-1,5]/.{0->-1,2->0,3->0,4->0},{n,60}]]] (* Harvey P. Dale, Jan 14 2024 *)