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Edit: More easily readable & faster programme.

The programme's name is P4. Input a positive integer in the Home screen & actuate the programme. For input N = 6 the screen displays:

p(6)
11
Exact to N = 180

Ans+1►N:
MAKELIST(1,X,1,N,1)►L1:
FOR I=2 TO N STEP 1;
1►H:
-1►V:
I-1►K:
0►A:
WHILE K>0
REPEAT
A*V+L1(K)►A:
FLOOR(2^V*H+1)►H:
-V►V:
K-H►K:
END:
ABS(A)►L1(I):
END:
ERASE:
DISP 2;" p("N-1"):":
DISP 4;" "L1(N):
DISP 6;"Exact to N = 180":
BEEP 1953;.18:
FREEZE:

You may find this link:

http://en.wikipedia.org/wiki/Partition_(number_theory)

informative concerning partitions.

Edit: Improved programme.