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Search: id:A121351
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| A121351 |
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An A053984-like Bessel-Binet recursion found by Bob Hanlon's new survey program: a[n] = (3*n + 1)*a[n - 1] - a[n - 2]. |
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1
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| 0, 1, 7, 69, 890, 14171, 268359, 5889727, 146974816, 4109405121, 127244583935, 4322206448669, 159794394016818, 6387453554224051, 274500708437617375, 12620645134576175199, 618137110885794967376, 32130509120926762128353
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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I had theorized that there were a related kind of Bessel-Binets of the form: a[n]=(a0*n+c0)*a[n-1]+b0*a[n-2] Where the a0,b0 and c0 were Integers. Bob Hanlon found ones with a0=2 in a program he wrote. A053984 was already in OEIS. This one is a0=3
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FORMULA
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a(n) = (3*n + 1)*a(n - 1) - a(n - 2) a(n)=(1/3) pi BesselJ[4/3 + n, 2/3] BesselY[4/3, 2/3] - (1/3) pi BesselJ[4/3, 2/3] BesselY[4/3 + n, 2/3]
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MATHEMATICA
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f[n_Integer] = Module[{a}, a[n] /. RSolve[{a[n] == (3*n + 1)*a[n - 1] - a[n - 2], a[0] == 0, a[1] == 1}, a[n], n][[1]] // FullSimplify] Rationalize[N[Table[f[n], {n, 0, 25}], 100], 0]
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CROSSREFS
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Cf. A053984, A001503.
Sequence in context: A122010 A084774 A025757 this_sequence A059321 A077683 A082797
Adjacent sequences: A121348 A121349 A121350 this_sequence A121352 A121353 A121354
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KEYWORD
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nonn,uned
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AUTHOR
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Roger Bagula and Bob Hanlon (rlbagulatftn(AT)yahoo.com), Sep 05 2006
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