1,2
Proposed by R. Guy in the seqfan list, Mar 29 2009.
a(n) = A139400(n)/ ( A001906(n)*A001353(n)*A004254(n)) = 13*a(n-1)-36*a(n-2)+13*a(n-3)-a(n-4).
Cf. A006238.
Sequence in context: A037582 A065539 A048554 this_sequence A037715 A037617 A081042
Adjacent sequences: A161495 A161496 A161497 this_sequence A161499 A161500 A161501
nonn
R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 11 2009
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