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 A366399 Triangle read by rows: T(n,k) is the number of paths traveling orthogonally on an n X k grid that visit every cell. 1
 1, 1, 4, 1, 8, 20, 1, 14, 62, 276, 1, 22, 132, 1006, 4324, 1, 32, 336, 3610, 26996, 229348, 1, 44, 688, 12010, 109722, 1620034, 13535280, 1, 58, 1578, 38984, 602804, 12071462, 175905310, 3023313284, 1, 74, 3190, 122188, 2434670, 82550864, 1449655468, 43551685370, 745416341496 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Table of n, a(n) for n=1..45. EXAMPLE T(n,k) is a triangular array read by rows: 1, 1, 4, 1, 8, 20, 1, 14, 62, 276, ... T(2,2) = 4: +---+---+ +---+---+ +---+---+ +---+---+ | | | | | | | | | | | | | **|** | | * | * | | **|** | | **|** | | | * | | * | * | | * | | | * | * | +---+---+ +---+---+ +---+---+ +---+---+ | | * | | * | * | | * | | | * | * | | **|** | | **|** | | **|** | | * | * | | | | | | | | | | | | | +---+---+ +---+---+ +---+---+ +---+---+ CROSSREFS See A332307 for another version. Cf. A120443 (T(n,n)), A366411 (row sums). Sequence in context: A013611 A297194 A077910 * A100235 A089072 A348595 Adjacent sequences: A366396 A366397 A366398 * A366400 A366401 A366402 KEYWORD tabl,nonn,walk AUTHOR Douglas Boffey, Oct 09 2023 EXTENSIONS More terms (using A332307) from Pontus von Brömssen, Oct 09 2023 STATUS approved

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Last modified March 1 09:35 EST 2024. Contains 370432 sequences. (Running on oeis4.)