53880

Appears in sequences

• Sum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026907.at n=15A026918
• Denominators of continued fraction convergents to sqrt(56).at n=7A041097
• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,17.at n=18A064245
• Sum of numbers that can be written as t*n + u*(n+1) for nonnegative integers t,u in exactly one way.at n=14A076454
• Structured truncated icosahedral numbers.at n=14A100154
• Number of reduced words of length n in Coxeter group on 16 generators S_i with relations (S_i)^2 = (S_i S_j)^4 = I.at n=4A163092
• Expansion of (1+4*x+x^2)/((1+x)^2*(1-x)^5).at n=28A233329
• Numbers k such that k+1, 2k+1, 3k+1, 4k+1 are all prime.at n=18A237189
• Triangle read by rows: T(n, k) = C(n, k)*C(2*k, k)/(k+1) - sum(j = 0..k, (-1)^j*(1-j)^n*C(k, j)/k!), 0<=k<=n.at n=62A247493
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 411", based on the 5-celled von Neumann neighborhood.at n=42A271891
• Number of winning positions for the next player (a, b, c) where 1 <= a, b, c <= n in "Divisor Nim" (see comments).at n=41A383226