login
A262612
Triangle read by rows T(n,k) in which column k lists the partial sums of the k-th column of triangle A236104.
8
1, 5, 14, 1, 30, 2, 55, 6, 91, 10, 1, 140, 19, 2, 204, 28, 3, 285, 44, 7, 385, 60, 11, 1, 506, 85, 15, 2, 650, 110, 24, 3, 819, 146, 33, 4, 1015, 182, 42, 8, 1240, 231, 58, 12, 1, 1496, 280, 74, 16, 2, 1785, 344, 90, 20, 3, 2109, 408, 115, 29, 4, 2470, 489, 140, 38, 5, 2870, 570, 165, 47, 9, 3311, 670, 201, 56, 13, 1
OFFSET
1,2
COMMENTS
Alternating sum of row n equals A175254(n), i.e., sum_{k=1..A003056(n))} (-1)^(k-1)*T(n,k) = A175254(n), which is also the volume (or the total number of units cubes) in the first n levels of the stepped pyramid described in A245092.
Row n has length A003056(n) hence the first element of column k is in row A000217(k).
EXAMPLE
Triangle begins:
1;
5;
14, 1;
30, 2;
55, 6;
91, 10, 1;
140, 19, 2;
204, 28, 3;
285, 44, 7;
385, 60, 11, 1;
506, 85, 15, 2;
650, 110, 24, 3;
819, 146, 33, 4;
1015, 182, 42, 8;
1240, 231, 58, 12, 1;
1496, 280, 74, 16, 2;
1785, 344, 90, 20, 3;
2109, 408, 115, 29, 4;
2470, 489, 140, 38, 5;
2870, 570, 165, 47, 9;
3311, 670, 201, 56, 13, 1;
3795, 770, 237, 72, 17, 2;
4324, 891, 273, 88, 21, 3;
4900, 1012, 322, 104, 25, 4;
...
For n = 6 we have that A175254(6) = [1] + [1 + 3] + [1 + 3 + 4] + [1 + 3 + 4 + 7] + [1 + 3 + 4 + 7 + 6] + [1 + 3 + 4 + 7 + 6 + 12] = 1 + 4 + 8 + 15 + 21 + 33 = 82. On the other hand the alternating sum of the 6th row of the triangle is 91 - 10 + 1 = 82, equaling A175254(6).
CROSSREFS
Column 1 gives A000330, n >= 1. Column 2 is A005993. It appears that column 3 is A092353.
Sequence in context: A127317 A049506 A069524 * A333025 A144518 A051542
KEYWORD
nonn,tabf
AUTHOR
Omar E. Pol, Nov 03 2015
STATUS
approved