Number of n X 2 0..3 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.

A201975

Number of n X 2 0..3 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.

Terms

    a(0) =4a(1) =30a(2) =72a(3) =131a(4) =208a(5) =304a(6) =420a(7) =557a(8) =716a(9) =898a(10) =1104a(11) =1335a(12) =1592a(13) =1876a(14) =2188a(15) =2529a(16) =2900a(17) =3302a(18) =3736a(19) =4203a(20) =4704a(21) =5240a(22) =5812a(23) =6421a(24) =7068a(25) =7754a(26) =8480a(27) =9247a(28) =10056a(29) =10908

External references