23858

Appears in sequences

• Triangle read by rows: T(n,k) is number of Dyck paths of semilength n having k ascents of length 1 that start at an odd level.at n=60A102405
• a(n) = a(n-1) + Sum_{k=1..floor(n/4)} a(n-4k), with a(0)=1.at n=30A113439
• Third row of A113439.at n=7A113442
• a(n) = prime(n)*(prime(n+1) + 1).at n=35A123134
• a(n) = A130179(n)/81.at n=23A130085
• Number of 0/1 colorings of an n X n square for which no 2 by 2 subsquare is monochromatic.at n=4A133130
• Number of n X 4 binary matrices with no 2 X 2 circuit having pattern 0101 in any orientation.at n=3A181239
• T(n,k) = Number of n X k binary matrices with no 2 X 2 circuit having pattern 0101 in any orientation.at n=24A181245
• Number of 3-step one space leftwards or up, two space rightwards or down asymmetric rook's tours on an n X n board summed over all starting positions.at n=39A187298
• Number of n X 2 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 3 binary array having a sum of three or less, with rows and columns of the latter in lexicographically nondecreasing order.at n=26A227265
• Number of (6+1) X (n+1) 0..1 arrays with every 2 X 2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.at n=9A258559