a(n) = Sum_{k=0..[n/2]} C(2^k + n-2k-1, n-2k); equals the antidiagonal sums of triangle A137153.
A137155
a(n) = Sum_{k=0..[n/2]} C(2^k + n-2k-1, n-2k); equals the antidiagonal sums of triangle A137153.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =9a(6) =17a(7) =35a(8) =80a(9) =201a(10) =561a(11) =1771a(12) =6298a(13) =25217a(14) =115440a(15) =605243a(16) =3609754a(17) =24742305a(18) =196470603a(19) =1792166979a(20) =18817616610a(21) =230233601737
External references
- oeis: A137155