Coefficient of x^n in expansion of x/((1-x-x^3)*(1-x)^(n-1)), also diagonal of A144903.
A144904
Coefficient of x^n in expansion of x/((1-x-x^3)*(1-x)^(n-1)), also diagonal of A144903.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =6a(4) =21a(5) =76a(6) =280a(7) =1045a(8) =3937a(9) =14938a(10) =56993a(11) =218414a(12) =840090a(13) =3241153a(14) =12537263a(15) =48604755a(16) =188799962a(17) =734631798a(18) =2862843281a(19) =11171582151a(20) =43647688211a(21) =170720728344a(22) =668414462009
External references
- oeis: A144904