Equations

Well to get D from T for (e, 1) I have this:

def getDFromT(e, t):
  if e == 0 or e % 2 == 0:
    return (e / 2) + 4 * ( (t * (t - 1) ) / 2)
  else:
    return int( (e + 1) / 2) + 2*t**2 - 1
And to get A from T I have this:

def getAFromT(e, t):
  if e % 2 == 0:
    return (e / 2) + 2*(t - 1)**2
  else:
    return int(e / 2) + 4 * ( (t * (t - 1)  ) /2 ) + 1
The reverse way:
To get T from D in (e, 1):

def getTFromD(e, d):
  if e % 2 == 0:
    t = d - (e / 2)
    t = t / 2
    t = t * 4 + 1
    t = t / 4
    t = math.sqrt(t) + 1
    return -1/2 + t
  else:
    t = d - (2 + int(e / 2))
    t = t / 2
    t = t + 1
    t = math.sqrt(t)
    t = t
  return t
To get T from A in (e, 1):

def getTFromA(e, a):
  if e % 2 == 0:
    return math.sqrt((a - (e / 2))/2)
  else:
    return math.sqrt((a - (e / 2))/2) + 0.5