OFFSET
1,2
LINKS
Keiichi Shigechi, Generalized Dellac configurations, arXiv:2104.02455 [math.CO], 2021. See p. 24.
FORMULA
T(n, 0) = 2*T(n-1, 0) + Sum_{k=1..n-2} T(n-1, k).
EXAMPLE
Triangle begins:
1
2 3
7 9 15
38 45 63 111
295 333 423 621 1131
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Michel Marcus, Apr 07 2021
STATUS
approved