A264820 a(n) is the number of 3 X n arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 3 and columns nondecreasing modulo 7.

1, 4, 59, 1644, 83599, 6680669, 731477306, 143970086832, 34012195507648, 13062257122667520, 5219737209117511680, 2681340168535896588288

Offset

1,2

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=5:
   9  0 10  7 14    0 12 14 11  8   12  0  7  1  4    9  7  4 14  8
   3  1  4  2  8    7 13 10  4  1   13 14  2  8 11    3  0 12  1 10
  12  6 13  5 11    9  6  3  5  2    6  3  9 10  5    6 13  5  2 11

Crossrefs

Row 3 of A264818.

Sequence in context: A280668 A198508 A126754 * A194534 A331712 A026586

Adjacent sequences: A264817 A264818 A264819 * A264821 A264822 A264823

Keyword

nonn,more

Author

R. H. Hardin, Nov 25 2015

Extensions

a(8)-a(12) from Bert Dobbelaere, May 12 2026

Status

approved