22040361

Appears in sequences

• Number of labeled 2-regular digraphs with n nodes.at n=8A007107
• Triangle T(n,k) read by rows: the number of n X n {0,1} matrices with trace k where each row sum and each column sum is 2.at n=36A284989
• Triangle T(n,t) read by rows: the number of n X n {0,1} matrices with trace t where each row sum and each column sum is 3.at n=44A284990
• Triangle T(n,k) read by rows: coefficients of polynomials P_n(t) defined in Formula section.at n=44A321711
• Triangle T(n,k) read by rows: Number of traceless binary n X n matrices with all row and column sums equal to k, 1<=k<=n.at n=29A364068
• Triangle T(n,k) read by rows: Number of traceless binary n X n matrices with all row and column sums equal to k, 1<=k<=n.at n=32A364068