135300

Appears in sequences

• Subtrees in rooted plane trees on n nodes.at n=8A007856
• Fibonacci sequence beginning 0, 20.at n=20A022354
• a(n) = n*Fibonacci(n).at n=20A045925
• Structured snub dodecahedral numbers.at n=19A100151
• Triangle of coefficients of polynomials in Sum_{k=0..n} binomial(n,k) * k^r.at n=52A102573
• Duplicate of A045925.at n=20A116562
• Number of cases in which the first player is killed in a Russian roulette game where 5 players use a gun with n chambers and the number of bullets can be from 1 to n. Players do not rotate the cylinder after the game starts.at n=17A119610
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, -1), (1, -1, 0), (1, 1, 1)}.at n=11A149113
• a(n+5) = a(n+4)+a(n+3)+a(n+2)+a(n+1)+2*a(n) with a(0)=0, a(1)=a(2)=a(3)=a(4)=1.at n=20A226310
• Numbers k such that k+1, 2k+1, 3k+1, 4k+1 are all prime.at n=34A237189
• a(n) = n*(n + 1)*(4*n + 5)/2.at n=40A281381
• Expansion of 1/((1 - 2*x)*(1 + x + x^2 + x^3 + x^4)).at n=18A349842