223536domain: NAppears in sequencesIntegers k such that 2*5^k - 1 is prime.at n=15A120375Number of 5-step self-avoiding walks on an n X n X n cube summed over all starting positions.at n=7A187166Number of arrays of length 4 that are sums of n consecutive elements of length 4+n-1 permutations of 0..4+n-2.at n=10A229567