OFFSET
0,4
EXAMPLE
Square array begins:
(1,1), 1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,...;
(1,2,3), 4, 5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,...;
(4,9,15,22), 30, 39,49,60,72,85,99,114,130,147,165,184,204,225,247,...;
(30,69,118,178,250), 335, 434,548,678,825,990,1174,1378,1603,1850,...;
(335,769,1317,1995,2820,3810), 4984, 6362,7965,9815,11935,14349,...;
(4984,11346,19311,29126,41061,55410,72492), 92652, 116262, 143722,...;
(92652,208914,352636,528097,740035,993678,1294776,1649634), 2065146,..;
(2065146,4613976,7722840,11476963,15971180,21310710,27611970,35003430,43626510),..;
where the rows are generated as follows.
Start row 0 with all 1's; from then on,
remove the first n+2 terms (shown in parenthesis) from row n
and then take partial sums to yield row n+1.
Note the second upper diagonal forms column 0 and equals A121413:
[1,1,4,30,335,4984,92652,2065146,53636520,1589752230,52926799310,...].
which equals column 3 of triangle A101479:
1;
1, 1;
1, 1, 1;
3, 2, 1, 1;
19, 9, 3, 1, 1;
191, 70, 18, 4, 1, 1;
2646, 795, 170, 30, 5, 1, 1;
46737, 11961, 2220, 335, 45, 6, 1, 1;
1003150, 224504, 37149, 4984, 581, 63, 7, 1, 1; ...
where row n equals row (n-1) of T^(n-1) with appended '1'.
PROG
(PARI) {T(n, k)=if(k<0, 0, if(n==0, 1, T(n, k-1) + T(n-1, k+n+1)))}
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Paul D. Hanna, Jan 19 2008
STATUS
approved