448224domain: NAppears in sequencesa(n) = (2n+1)*(2n+2)*(2n+6)*(2n+7).at n=11A069080Number of -n..n arrays x(0..5) of 6 elements with zero sum and no two or three adjacent elements summing to zero.at n=7A200433a(n) = 4*3*2*1 + 8*7*6*5 + 12*11*10*9 + 16*15*14*13 + ... + (up to the n-th term).at n=26A319868