a(n) = Sum_{k=0..n} C(2k,k)*C(2k,n-k); equals row 0 of square array A137634.
A137635
a(n) = Sum_{k=0..n} C(2k,k)*C(2k,n-k); equals row 0 of square array A137634.
Terms
- a(0) =1a(1) =2a(2) =10a(3) =46a(4) =226a(5) =1136a(6) =5810a(7) =30080a(8) =157162a(9) =826992a(10) =4376408a(11) =23267332a(12) =124179570a(13) =664919780a(14) =3570265000a(15) =19216805476a(16) =103652442922a(17) =560127574340
External references
- oeis: A137635