OFFSET
1,2
FORMULA
EXAMPLE
First few rows of the triangle =
k=1 k=2 k=3 k=4 k=5 k=6 k=7
n=1: 1;
n=2: 3, 2;
n=3: 4, 3, 1;
n=4: 7, 6, 4, 3;
n=5: 8, 7, 5, 4, 1;
n=6: 10, 9, 7, 6, 3, 2;
n=7: 11, 10, 8, 7, 4, 3, 1;
...
Row 6 = (10, 9, 7, 6, 3, 2) = partial sums of the first 6 terms of the ruler sequence, starting from the right: (1, 2, 1, 3, 1, 2,...).
PROG
(PARI) T(n, k) = k--; 2*(n-k) - hammingweight(n) + hammingweight(k); \\ Kevin Ryde, Oct 07 2021
CROSSREFS
KEYWORD
AUTHOR
Gary W. Adamson, Jul 27 2008
STATUS
approved