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A198759
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The number of pairs of braces to note the properly nested set with n elements.
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2
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1, 2, 4, 7, 11, 15, 20, 25, 30, 36, 42, 48, 54, 60, 66, 73, 80, 87, 94, 101, 108, 115, 122, 129, 136, 143, 150, 158, 166, 174, 182, 190, 198, 206, 214, 222, 230, 238, 246, 254, 262, 270, 278, 286, 294, 302, 310, 318, 326, 334, 342, 350, 359, 368, 377, 386, 395
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OFFSET
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0,2
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LINKS
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MAPLE
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# implementing the Adams-Watters partial sum formula up to nmax elements
read("transforms") ;
nmax := 40 ;
a004111rep := [1, 1] ;
n := 2 ;
while nops(a004111rep) < nmax do
a004111rep := [op(a004111rep), seq(n, i=1..A004111(n))] ;
n := n+1 ;
end do:
PSUM(a004111rep) ;
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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