244303domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of ways to arrange 2 nonattacking knights on the lower triangle of an n X n board.at n=36A194486Number of (n+1) X (3+1) 0..2 arrays with every 2 X 2 subblock summing to 4 and no 2 X 2 subblock having exactly two nonzero entries.at n=14A251144Prime numbersat n=21571