OFFSET
0,3
EXAMPLE
A048996 begins 1,1,1,1,1,2,1, 1, 2, 1, 3, 1 ...
A178801 begins 1,1,2,2,6,6,6,24,24,24,24,24,...
therefore
a(n) begins 1,1,2,2,6,12,6,...
with row sums 1, 1, 4, 24, 192, 1920, 23040, ... .
Triangle begins:
1;
1;
2, 2;
6, 12, 6;
24, 48, 24, 72, 24;
120, 240, 240, 360, 360, 480, 120;
720, 1440, 1440, 720, 2160, 4320, 720, 2880, 4320, 3600, 720;
...
CROSSREFS
KEYWORD
easy,nonn,tabf
AUTHOR
Alford Arnold, Jun 15 2010
STATUS
approved