70549050

Appears in sequences

• Even minus odd extensions of truncated 3 X 2n grid diagram.at n=7A007724
• Number of permutations of 0..floor((3*n-1)/2) on even squares of an 3*n array such that each row, column, diagonal and (downwards) antidiagonal of even squares is increasing.at n=17A215789
• Number of permutations of 0..floor((3*n-2)/2) on odd squares of an 3Xn array such that each row, column, diagonal and (downwards) antidiagonal of odd squares is increasing.at n=17A215871
• Number of alternating permutations on 2n+1 letters that avoid a certain pattern of length 4 (see Lewis, 2012, Appendix, for precise definition).at n=8A217800
• Duplicate of A217800.at n=8A241958