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 A291080 Irregular triangle read by rows: T(n,m) = number of lattice paths of type {A^H}_R terminating at point (n, m). 0
 1, 3, 2, 1, 19, 16, 10, 4, 1, 141, 126, 90, 50, 21, 6, 1, 1107, 1016, 784, 504, 266, 112, 36, 8, 1, 8953, 8350, 6765, 4740, 2850, 1452, 615, 210, 55, 10, 1, 73789, 69576, 58278, 43252, 28314, 16236, 8074, 3432, 1221, 352, 78, 12, 1, 616227, 585690, 502593, 388752, 270270, 168168, 93093, 45474, 19383, 7098, 2184, 546, 105, 14, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..63. 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, 3,2,1, 19,16,10,4,1, 141,126,90,50,21,6,1, 1107,1016,784,504,266,112,36,8,1, 8953,8350,6765,4740,2850,1452,615,210,55,10,1, 73789,69576,58278,43252,28314,16236,8074,3432,1221,352,78,12,1, 616227,585690,502593,388752,270270,168168,93093,45474,19383,7098,2184,546,105,14,1, ... CROSSREFS First column is A082758. Sequence in context: A129377 A136733 A117269 * A107862 A117265 A107727 Adjacent sequences: A291077 A291078 A291079 * A291081 A291082 A291083 KEYWORD nonn,tabf AUTHOR N. J. A. Sloane, Aug 19 2017 STATUS approved

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Last modified December 5 00:23 EST 2023. Contains 367565 sequences. (Running on oeis4.)