1232377domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of (n+1) X (n+1) -5..5 symmetric matrices with every 2 X 2 subblock having sum zero and one or three distinct values.at n=15A211331Prime generating polynomial: a(n) = 32502 n^2 - 1727988 n + 24009847.at n=29A392928Prime numbersat n=95221