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 A347679 Irregular triangle read by rows: T(n,k) (1 <= k <= 2*n) = number of n X k Baxter matrices in which all row sums are 2. 2
 0, 1, 0, 0, 2, 4, 0, 0, 0, 3, 24, 26, 0, 0, 0, 0, 8, 98, 284, 214, 0, 0, 0, 0, 0, 19, 374, 1922, 3496, 2030, 0, 0, 0, 0, 0, 0, 44, 1342, 10620, 33398, 44674, 21174, 0, 0, 0, 0, 0, 0, 0, 111, 4596, 51904, 245684, 554500, 589092, 236410 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 LINKS Table of n, a(n) for n=1..56. Don Knuth, Baxter matrices, Preprint, Sep 05 2021. EXAMPLE The T(4,5)=8 matrices of size 4 X 5 are . 0 0 0 1 1 0 0 0 1 1 0 1 0 0 1 1 0 0 0 1 0 0 1 1 0 1 0 0 1 0 0 0 1 1 0 0 0 1 1 0 0 1 1 0 0 0 1 1 0 0 0 1 0 0 1 0 1 1 0 0 1 1 0 0 0 1 0 0 1 0 1 1 0 0 0 1 0 0 0 1 . 1 0 0 0 1 1 0 0 1 0 1 1 0 0 0 1 1 0 0 0 0 1 1 0 0 0 1 1 0 0 0 1 0 0 1 0 1 1 0 0 0 0 1 1 0 1 0 0 1 0 0 0 1 1 0 0 0 1 1 0 1 0 0 0 1 0 0 0 1 1 0 1 0 0 1 0 0 0 1 1 CROSSREFS Cf. A347678, A347736 (superdiagonal). Sequence in context: A138758 A107501 A126732 * A028586 A253179 A300723 Adjacent sequences: A347676 A347677 A347678 * A347680 A347681 A347682 KEYWORD nonn,tabf,more AUTHOR N. J. A. Sloane, Sep 10 2021 STATUS approved

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Last modified June 8 18:04 EDT 2023. Contains 363165 sequences. (Running on oeis4.)