Triangle T(n, k) is coefficient of z^n*w^k in 1/(1 - 2*z - 2*w - 2*z*w) read by rows in order 00, 10, 01, 20, 11, 02, ...

A059473

Triangle T(n, k) is coefficient of z^n*w^k in 1/(1 - 2*z - 2*w - 2*z*w) read by rows in order 00, 10, 01, 20, 11, 02, ...

Terms

    a(0) =1a(1) =2a(2) =2a(3) =4a(4) =10a(5) =4a(6) =8a(7) =32a(8) =32a(9) =8a(10) =16a(11) =88a(12) =148a(13) =88a(14) =16a(15) =32a(16) =224a(17) =536a(18) =536a(19) =224a(20) =32a(21) =64a(22) =544a(23) =1696a(24) =2440a(25) =1696a(26) =544a(27) =64a(28) =128a(29) =1280

External references