Array read by antidiagonals: T(n,k) = n! * Sum_{s} 2^(Sum_{i=1..k-1} s(i)*s(i+1))/(Product_{i=1..k} s(i)!) where the sum is over all nonnegative compositions s of n into k parts.
A361950
Array read by antidiagonals: T(n,k) = n! * Sum_{s} 2^(Sum_{i=1..k-1} s(i)*s(i+1))/(Product_{i=1..k} s(i)!) where the sum is over all nonnegative compositions s of n into k parts.
Terms
- a(0) =1a(1) =1a(2) =0a(3) =1a(4) =1a(5) =0a(6) =1a(7) =2a(8) =1a(9) =0a(10) =1a(11) =3a(12) =6a(13) =1a(14) =0a(15) =1a(16) =4a(17) =13a(18) =26a(19) =1a(20) =0a(21) =1a(22) =5a(23) =22a(24) =81a(25) =162a(26) =1a(27) =0a(28) =1a(29) =6
External references
- oeis: A361950