80530636

Appears in sequences

• Expansion of (1-x^2)/((1-2*x)*(1+x^2)).at n=27A100088
• Decimal representation of the middle column of the "Rule 147" elementary cellular automaton starting with a single ON (black) cell.at n=26A262864
• a(n) = a(n-2) + 4*a(n-3) - 4*a(n-5), where a(0) = 1, a(1) = 4, a(2) = 7, a(3) = 12, a(4) = 19, a(5) = 28.at n=37A297554
• a(n) = a(n-1) + 16*a(n-3) - 16*a(n-4), where a(0) = 1, a(1) = 4, a(2) = 8, a(3) = 12, a(4) = 76.at n=19A297555