173538domain: NAppears in sequencesNumber of nX3 0..1 arrays with each 1 adjacent to 3, 4 or 6 king-move neighboring 1s.at n=11A297015a(n) is the smallest number which can be represented as the sum of n distinct centered n-gonal numbers in exactly n ways, or -1 if no such number exists.at n=28A352975