377755domain: NAppears in sequencesPentagonal numbers with only odd digits.at n=25A117985Number of (n+2) X 6 0..1 arrays with every 3 X 3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly three ways, and new values 0..1 introduced in row major order.at n=22A204377