Irregular triangle T(n, k) = A000032(n-2*k+1) if (n-2*k) mod 2 = 0, otherwise 25*A000032(n-2*k), read by rows.
A158786
Irregular triangle T(n, k) = A000032(n-2*k+1) if (n-2*k) mod 2 = 0, otherwise 25*A000032(n-2*k), read by rows.
Terms
- a(0) =1a(1) =25a(2) =4a(3) =1a(4) =100a(5) =25a(6) =11a(7) =4a(8) =1a(9) =275a(10) =100a(11) =25a(12) =29a(13) =11a(14) =4a(15) =1a(16) =725a(17) =275a(18) =100a(19) =25a(20) =76a(21) =29a(22) =11a(23) =4a(24) =1a(25) =1900a(26) =725a(27) =275a(28) =100a(29) =25
External references
- oeis: A158786