OFFSET
1,2
COMMENTS
A "Pascal Staircase".
The zero entries simplify the definition, but are not part of the official triangle.
LINKS
Alois P. Heinz, Rows n = 1..200, flattened
Ozer Ozturk and Piotr Pragacz, On Schur function expansions of Thom polynomials, arXiv:1111.6612 [math.AG], 2011-2012. See (59), p. 22.
EXAMPLE
Triangle begins:
1
3
7 3
15 10
31 25 10
63 56 35
127 119 91 35
...
MATHEMATICA
With[{rowmax=20}, DeleteCases[Transpose[PadLeft[NestWhileList[Accumulate[#[[2;; -2]]]&, 2^Range[rowmax]-1, Length[#]>2&]]], 0, 2]] (* Paolo Xausa, Nov 07 2023 *)
CROSSREFS
KEYWORD
nonn,tabf,easy
AUTHOR
Jonathan Vos Post, Nov 30 2011
EXTENSIONS
Entry revised by N. J. A. Sloane, Nov 07 2023
STATUS
approved