a(n) equals the sum of the squares of the expansion coefficients for (x + y + 2*z)^n.
A186375
a(n) equals the sum of the squares of the expansion coefficients for (x + y + 2*z)^n.
Terms
- a(0) =1a(1) =6a(2) =54a(3) =588a(4) =7110a(5) =91476a(6) =1224636a(7) =16849944a(8) =236523078a(9) =3371140740a(10) =48630906324a(11) =708412918824
External references
- oeis: A186375