83721

Appears in sequences

• a(0) = 1, a(n) = 1 + 2*3 + 4*5 + 6*7 + ... + (2n)*(2n+1) for n > 0.at n=39A098931
• Expansion of (1-3*x^2+x^3)/(1-3*x+x^3).at n=11A123891
• Number of binary strings of length n with equal numbers of 00001 and 00010 substrings.at n=17A164192
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 299", based on the 5-celled von Neumann neighborhood.at n=32A280835
• Centered pentachoral numbers.at n=13A365205