A152151 Riordan array [(1-x)exp(x/(1-x)),x].

1, 0, 1, 1, 0, 1, 4, 3, 0, 1, 21, 16, 6, 0, 1, 136, 105, 40, 10, 0, 1, 1045, 816, 315, 80, 15, 0, 1, 9276, 7315, 2856, 735, 140, 21, 0, 1, 93289, 74208, 29260, 7616, 1470, 224, 28, 0, 1, 1047376, 839601, 333936, 87780, 17136, 2646, 336, 36

Offset: 0

Author

Paul Barry, Nov 26 2008

Keywords

• easy
• nonn
• tabl

Comments

First column is essentially A052852.

Examples

			Triangle begins
1,
0, 1,
1, 0, 1,
4, 3, 0, 1,
21, 16, 6, 0, 1,
136, 105, 40, 10, 0, 1,
1045, 816, 315, 80, 15, 0, 1,
9276, 7315, 2856, 735, 140, 21, 0, 1,
with production matrix which begins
0, 1,
1, 0, 1,
4, 2, 0, 1,
18, 12, 3, 0, 1,
96, 72, 24, 4, 0, 1,
600, 480, 180, 40, 5, 0, 1;
4320, 3600, 1440, 360, 60, 6, 1
with e.g.f. exp(x*t)(t+1/(1-x)^2).