OFFSET
1,2
LINKS
E. Banaian, S. Butler, C. Cox, J. Davis, J. Landgraf and S. Ponce, A generalization of Eulerian numbers via rook placements, arXiv:1508.03673 [math.CO], 2015.
A. N. Bhavale, B. N. Waphare, Basic retracts and counting of lattices, Australasian J. of Combinatorics (2020) Vol. 78, No. 1, 73-99.
EXAMPLE
Triangle begins:
1,
4,7,
26,68,75,
236,940,1090,1105,
2752,16645,20360,20790,20821,
39208,360081,464111,477242,478376,478439,
660032,9202170,12492277,12933423,12974826,12977688,12977815,
...
CROSSREFS
KEYWORD
AUTHOR
N. J. A. Sloane, Mar 16 2016
STATUS
approved