Number of 3 X n nonnegative integer matrices with all column sums 4, up to row and column permutation.

A058408

Number of 3 X n nonnegative integer matrices with all column sums 4, up to row and column permutation.

Terms

    a(0) =1a(1) =4a(2) =26a(3) =129a(4) =546a(5) =2010a(6) =6615a(7) =19650a(8) =53790a(9) =137035a(10) =328262a(11) =745078a(12) =1613072a(13) =3348198a(14) =6693822a(15) =12937656a(16) =24253200a(17) =44219610a(18) =78604130a(19) =136511100a(20) =232054284a(21) =386737802a(22) =632819628a(23) =1017983052a(24) =1611768873a(25) =2514310812a(26) =3868112340a(27) =5873727245a(28) =8810503300a(29) =13063741460

External references