18738639

Appears in sequences

• Number of base-3 circular n-digit numbers with adjacent digits differing by 1 or less.at n=19A124696
• Number of independent vertex sets in the Moebius ladder graph with 2n nodes (n >= 0).at n=19A182143
• Length of the short leg of the unique primitive Pythagorean triple whose inradius is A002315(n) and such that its long leg and its hypotenuse are consecutive natural numbers.at n=9A377725