Expansion of g.f. (1 - x)*(1 - 2*x)(1 - 4*x)/(1 - 8*x + 20*x^2 - 18*x^3 + 3*x^4).
A374165
Expansion of g.f. (1 - x)*(1 - 2*x)(1 - 4*x)/(1 - 8*x + 20*x^2 - 18*x^3 + 3*x^4).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =23a(5) =97a(6) =418a(7) =1800a(8) =7717a(9) =32969a(10) =140558a(11) =598590a(12) =2547851a(13) =10842145a(14) =46133086a(15) =196287336a(16) =835152025a(17) =3553338593a(18) =15118441034a(19) =64324630854a(20) =273682864751
External references
- oeis: A374165