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A067231 Number of Young tableaux with n=i*j cells and type i*j matrices. Here i and j is i=>j. 0
1, 1, 1, 3, 1, 6, 1, 15, 43, 43, 1, 595, 1, 430, 6007, 25455, 1, 92379, 1, 1679601, 1385671, 58787, 1, 163809451, 701149021, 742901, 414315331, 13675080331, 1, 404155466746, 1, 1489913284351, 145862174641, 129644791, 278607172289161 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

FORMULA

a(n) = number of ways to arrange the numbers 1, 2, .., n=i*j in i*j matrices so that each row and each column is increasing. Here i and j satisfy i >= j.

CROSSREFS

Cf. A000085, A060854.

Sequence in context: A202851 A007650 A165552 * A145791 A130302 A134546

Adjacent sequences:  A067228 A067229 A067230 * A067232 A067233 A067234

KEYWORD

easy,nonn

AUTHOR

Naohiro Nomoto (n_nomoto(AT)yabumi.com), Feb 20 2002

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Last modified February 15 21:56 EST 2012. Contains 205860 sequences.