23988

Appears in sequences

• Same triangle as A106243, but with rows read in boustrophedon manner, i.e., in the order in which they were created.at n=39A106242
• Triangle read by rows from left to right. However, triangle is constructed in the boustrophedon way, reading alternately right to left and left to right. Top entry is 1. In all later rows, initial entry is 0, other entries are sum of previous entry in that row plus sum of two entries above it in previous row.at n=41A106243
• Number of permutations of 1..n with all differences of elements separated by distances 1 through 7 being respectively unique.at n=21A170813
• Number of (n+2) X 3 binary arrays avoiding patterns 001 and 110 in rows, columns and nw-to-se diagonals.at n=28A202440
• Floor of the expected value of number of trials until exactly five cells are empty in a random distribution of n balls in n cells.at n=28A210116
• Number of 2 X 2 matrices having all elements in {0,1,...,n} and determinant = 1 (mod 3).at n=16A211034
• Expansion of Product_{k>=0} (1+x^(3*k+1))^4.at n=43A261637
• a(n) is the least k such that 3^k == A047471(n) (mod 2^A047471(n)).at n=4A339774
• On a spirally numbered square grid, with labels starting at 1, this is the number of steps that an (n,n+1) leaper makes before getting trapped, or -1 if it never gets trapped.at n=15A343178