cp's OEIS Frontend

A110956 a(n) = permanent of the n X n matrix M of zeros and ones defined as follows: if we concatenate the rows of M to form a vector v of length n^2, v_i = 0 if i is an entry from the sequence A045506 (inscribe 2 spheres of curvature 2 inside sphere of curvature -1, continue to inscribe spheres where possible; the sequence gives list of curvatures).