873811

Appears in sequences

• Generalized Jacobsthal numbers.at n=19A084640
• a(n) = 2*a(n-1) + a(n-2) - 2*a(n-3).at n=19A140359
• a(n) = (5*2^n - 2*(-1)^n - 9)/3.at n=18A173078
• a(n) = 10*(4^n - 1)/3 + 1.at n=9A321421
• a(n) = (5*2^n + 7*(-1)^n)/3.at n=19A344109