486103domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of n X 3 binary arrays with every 1 immediately preceded by 0 to the left or above.at n=7A203357T(n,k)=Number of nXk binary arrays with every 1 immediately preceded by 0 to the left or above.at n=47A203362Prime numbersat n=40454