213280

Appears in sequences

• Numbers k such that k*Sum_{d|k} 1/sigma(d) is an integer.at n=34A069166
• Number of tilings using monominoes and L-trominoes in 2 X n chessboard, such that three monominoes cannot occur together in shape of L-tromino.at n=15A227959
• Number of semi-magic (only short lines are magic) knight's tours on a 4 X n board.at n=17A309273
• Number of semi-magic (only short lines are magic) knight's tours on a 4 X 2n board.at n=8A328816