OFFSET
1,2
COMMENTS
Row sums = A059722: (1, 10, 39, 100, ...).
Right border of the triangle = A056220: (1, 7, 17, 31, 49, ...).
Left border = A058331: (1, 3, 9, 19, 33, 51, ...).
Connell-like triangle read by rows: odd rows are in the set 4n-3, evens are in 4n-1. Leftmost term in the next row is the next higher term consistent with the modular rule.
Given A056220: (1, 7, 17, 31, 49, 71, ...) as the rightmost diagonal; the triangle is generated starting from the right: (n-th term of A056220, then (n-1) operations of the trajectory (-4), (-4), (-4), ...
Row 3 = (9, 13, 17) since beginning with A056220(3) = 17 as rightmost term, we perform two operations of (-4), -(4)j.
EXAMPLE
PROG
(Python)
from math import isqrt
def A143803(n): return ((m:=n<<1)-(k:=isqrt(m))-int(m>=k*(k+1)+1)<<1)-1 # Chai Wah Wu, Aug 01 2022
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Sep 01 2008
STATUS
approved