Number of nX4 0..1 arrays with rows and columns lexicographically nondecreasing and the instance counts of every value within one of each other.

A201380

Number of nX4 0..1 arrays with rows and columns lexicographically nondecreasing and the instance counts of every value within one of each other.

Terms

    a(0) =1a(1) =7a(2) =27a(3) =121a(4) =483a(5) =1751a(6) =5694a(7) =16870a(8) =46014a(9) =116842a(10) =278837a(11) =630353a(12) =1358517a(13) =2806843a(14) =5584567a(15) =10741640a(16) =20039166a(17) =36362252a(18) =64333159a(19) =111214759a(20) =188207532a(21) =312302096a(22) =508868575a(23) =815256003a(24) =1285706310a(25) =1998034336a(26) =3062559792

External references