来自在线整数百科全书的问候语!http://oeis.org/ Search: id:a172584 Showing 1-1 of 1 %I A172584 %S A172584 1,60871300,2407147216735338000,4847907059804908291247055000000, %T A172584 189746842198224628153363826062842999921000000, %U A172584 80261625461932627702056015943137363301590520498062576000000 %N A172584 Number of 4*n X 3*n 0..1 arrays with row sums 3 and column sums 4. %H A172584 R. H. Hardin,n,a(n)n=1…24的表%F A172584a(n)=24 ^(-3n)*(3n)!(4n)!* Suthi{{=0…2n} SUMU{{j=0…min(3N-I,4N-2I)} SUMU{{K=0…min(3N-J-I,4N-2i-J)}((-1)^ j*3 ^ i*6 ^ j*8 ^ k*(12N-4i-2J-3K)!/((3N-i-J-K)!我!J!K!(4N-2i-J-K)!* 6 ^(4N-2i-J-K))。-山山镇高,2月19日2010‰O A172584-(PARI)A(n)=24 ^(- 3×N)*(3×N)!*(4×N)!*和(i=0, 2×n,和(j=0,min(3×n- i,4×n-2*i)),和(k=0,min(3*nj-i,4 *n-2*i-j),((-1)^ j * 3 ^ i * 6 ^ j * 8 ^ k *)(12 *n*4*i-2*j-3*k)!/((3×Ni-i-J-K)!*我!*J!* K!*(4*N-2*i-J-K)!* 6 ^(4*N-2*i-J-K-Y.O.S.);1月18日2018 K %A172584-NAN2508O A1725841,2%AA172584R.H.HduliNi,FEB 06 2010‰内容在OEIS最终用户许可协议下可用:HTTP:/OEIS.Org/许可证