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A211877
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Number of involutions in GL(n,4).
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1
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1, 21, 673, 102273, 47663617, 110981851137, 815432848809985, 30052835284679819265, 3519512226295269640765441, 2069751512310185039905834926081, 3874510079394593253089862950754189313, 36431456010689490638771956423547489198538753
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history;
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internal format)
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OFFSET
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1,2
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LINKS
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MAPLE
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add( 4^(k*(n-k))*A022168(n, k), k=1..n) ;
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MATHEMATICA
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Sum[q^(k (n - k)) QBinomial[n, k, q], {k, 1, n}]
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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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