18890

Appears in sequences

• a(n) = sigma_3(n) - sigma_2(n) - sigma_1(n).at n=25A092350
• Triangle read by rows: T(n,k) is number of paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1), U=(1,2), or d=(1,-1) and having k U=(1,2) steps among the steps leading to the first d step.at n=22A108441
• Number of ways to place 4n nonattacking kings on an 8 X 2n cylindrical chessboard.at n=4A194646
• Number of ways to place 5n nonattacking kings on a vertical cylinder 10 X 2n.at n=3A195593
• Sum of the squarefree parts of the partitions of n into 4 parts.at n=45A309479
• Number of length-n binary words whose longest repeated suffix equals the longest repeated prefix.at n=16A327544
• Numbers that cannot be expressed as the sum of one or more numbers without any repeated digits.at n=2A342080
• Index of prime(n) in A353709, or -1 if prime(n) does not appear in A353709.at n=42A353719
• Records in A353717.at n=21A353722