3145738domain: NAppears in sequencesNumber of (n+1) X (n+1) -11..11 symmetric matrices with every 2 X 2 subblock having sum zero and two or four distinct values.at n=17A211715Consecutive states of the linear congruential pseudo-random number generator (262145*s+3) mod 2^35 when started at s=1.at n=3A384610