70226

Appears in sequences

• a(0) = 1, a(1) = 2, a(n) = 4*a(n-1) - a(n-2).at n=9A001075
• Related to Genocchi numbers.at n=9A002317
• a(2*n) = a(2*n-1) + a(2*n-2), a(2*n+1) = 2*a(2*n) + a(2*n-1); a(0) = a(1) = 1.at n=18A002531
• a(n) = (1 + a(n-1)*a(n-2))/a(n-3), a(0) = a(1) = a(2) = 1.at n=19A005246
• Hoggatt sequence with parameter d=6.at n=6A005364
• Numerators of continued fraction convergents to sqrt(27).at n=5A041042
• Numerators of continued fraction convergents to sqrt(75).at n=11A041132
• Numerators of continued fraction convergents to sqrt(243).at n=9A041454
• Numerators of continued fraction convergents to sqrt(675).at n=5A042298
• Numerators of continued fraction convergents to sqrt(867).at n=5A042674
• Numbers k such that k^2-1 and k^2 are consecutive powerful numbers.at n=10A060860
• a(n) = 14*a(n-1) - a(n-2); a(0) = a(1) = 2.at n=5A094347
• a(n+1) = 4*a(n)^3 - 3*a(n), with a(0) = 2.at n=2A094680
• a(n) = 2702*a(n-1) - a(n-2); a(-1) = a(0) = 26.at n=2A094835
• Number triangle associated to Chebyshev polynomials of first kind.at n=68A101124
• Indices of primes in sequence defined by A(0) = 73, A(n) = 10*A(n-1) + 53 for n > 0.at n=11A101151
• x such that x^2 - 27*y^2 = 1.at n=3A114052
• Limit of reversed rows of triangle A126347, in which row sums equal Bell numbers (A000110).at n=27A126348
• Interleave denominators and numerators of convergents to sqrt(3).at n=26A140827
• Numerators of principal and intermediate convergents to 3^(1/2).at n=25A143642