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A054092
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T(n,n), array T as in A054090.
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0
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1, 1, 1, 3, 7, 25, 105, 547, 3367, 24033, 195169, 1777651, 17950551, 199059673, 2405063017, 31448531955, 442501797655, 6666753146497, 107081325959937, 1826636018849443, 32980276187719399, 628351055737088601
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OFFSET
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0,4
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LINKS
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PROG
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(PARI) {a(n)= local(A); if(n<3, n>=0, A=vector(n, i, 1); for(k=1, n-2, A[k+2]=(k-1)*A[k+1]+ k*A[k]+ 2); A[n])} /* Michael Somos, Nov 19 2006 */
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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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