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Search: id:A091553
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| A091553 |
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Third column (k=6) sequence of array A090214 ((4,4)-Stirling2) divided by 72. |
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+0
2
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| 1, 704, 300096, 113762304, 41644855296, 15075073327104, 5436979231850496, 1958506906364411904, 705205813266345885696, 253891292037560301256704, 91402929045514567230160896, 32905302125838589613523861504
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OFFSET
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0,2
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FORMULA
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a(n)= A090214(n+2, 6)/72, n>=0.
a(n)= (15*(6*5*4*3)^n - 10*(5*4*3*2)^n + (4*3*2*1)^n)/3!.
G.f.: (1+200*x)/product(1-fallfac(p, 4)*x, p=4..6), with fallfac(n, m) := A008279(n, m) (falling factorials).
a(n)= ((4!)^n)*(1-2*5^(n+1)+binomial(6, 2)^(n+1))/3!. From eq.12 of the Blasiak et al. reference given in A078740 with r=4=s, k=6.
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CROSSREFS
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Cf. A089518 (third column of array (3, 3)-Stirling2 divided by 9).
Sequence in context: A133215 A083735 A105846 this_sequence A126830 A005845 A074869
Adjacent sequences: A091550 A091551 A091552 this_sequence A091554 A091555 A091556
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KEYWORD
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nonn,easy
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang_AT_physik_DOT_uni-karlsruhe_DOT_de), Feb 13 2004
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