A291085 - OEIS

A291085

Irregular triangle read by rows: T(n,m) = number of lattice paths of type B^H terminating at point (n, m).

1, 1, 4, 4, 2, 1, 20, 19, 13, 8, 3, 1, 104, 98, 76, 52, 28, 13, 4, 1, 556, 526, 434, 319, 201, 111, 50, 19, 5, 1, 3032, 2887, 2470, 1910, 1316, 811, 436, 205, 80, 26, 6, 1, 16778, 16073, 14085, 11304, 8259, 5489, 3284, 1763, 833, 344, 119, 34, 7, 1, 93872, 90386, 80584, 66514, 50680, 35588, 22912, 13476, 7176, 3437, 1456, 539, 168, 43, 8, 1

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OFFSET

0,3

LINKS

Table of n, a(n) for n=0..71.

Veronika Irvine, Lace Tessellations: A mathematical model for bobbin lace and an exhaustive combinatorial search for patterns, PhD Dissertation, University of Victoria, 2016.

EXAMPLE

Triangle begins:

1,1,

4,4,2,1,

20,19,13,8,3,1,

104,98,76,52,28,13,4,1,