48330domain: NAppears in sequencesNumber of n X n arrays of squares of integers summing to 30 with every element equal to at least one neighbor.at n=2A146545Numerator of Euler(n, 2/29).at n=4A157269a(n) is the smallest b >= 2 such that 1 + Sum_{k=0..n} b^(2^k) is prime, or 1 if no such b exists.at n=16A352736