Number of 3 X 3 X 3 triangular 0..n arrays with every horizontal row nondecreasing, first elements of rows nonincreasing, last elements of rows nondecreasing, and every row having the same average value.

A215183

Number of 3 X 3 X 3 triangular 0..n arrays with every horizontal row nondecreasing, first elements of rows nonincreasing, last elements of rows nondecreasing, and every row having the same average value.

Terms

    a(0) =2a(1) =5a(2) =12a(3) =22a(4) =38a(5) =64a(6) =98a(7) =145a(8) =210a(9) =291a(10) =394a(11) =526a(12) =684a(13) =876a(14) =1110a(15) =1383a(16) =1704a(17) =2083a(18) =2516a(19) =3014a(20) =3588a(21) =4234a(22) =4964a(23) =5791a(24) =6710a(25) =7735a(26) =8880a(27) =10140a(28) =11530a(29) =13066

External references