Fill an array by antidiagonals upwards; in the top left cell enter a(0)=1; thereafter, in the n-th cell, enter the sum of the entries of those earlier cells that can be seen from that cell.

A279212

Fill an array by antidiagonals upwards; in the top left cell enter a(0)=1; thereafter, in the n-th cell, enter the sum of the entries of those earlier cells that can be seen from that cell.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =2a(4) =6a(5) =11a(6) =4a(7) =15a(8) =39a(9) =72a(10) =8a(11) =37a(12) =119a(13) =293a(14) =543a(15) =16a(16) =88a(17) =330a(18) =976a(19) =2364a(20) =4403a(21) =32a(22) =204a(23) =870a(24) =2944a(25) =8373a(26) =20072a(27) =37527a(28) =64a(29) =464

External references