1/(1 - x - x^2 + x^4 - x^6) =
1 + x + 2 x^2 + 3 x^3 + 4 x^4 + 6 x^5 + 9 x^6 + 13 x^7 + 20 x^8 + 30 x^9 + 45 x^10 + 68 x^11 + 102 x^12 + 153 x^13 + 230 x^14 + 345 x^15 + 518 x^16 + 778 x^17 + 1168 x^18 + 1754 x^19 + 2634 x^20 + 3955 x^21 + 5939 x^22 + 8918 x^23 + 13391 x^24 + 20108 x^25 + 30194 x^26 + 45339 x^27 + 68081 x^28 + 102230 x^29 + 153508 x^30 + 230507 x^31 + 346128 x^32 + 519744 x^33 + 780445 x^34 + 1171912 x^35 + 1759737 x^36 + 2642412 x^37 + 3967832 x^38 + 5958076 x^39 + 8946616 x^40 + 13434192 x^41 + 20172713 x^42 + 30291241 x^43 + 45485170 x^44 + 68300295 x^45 + 102559368 x^46 + 154002614 x^47 + 231249525 x^48 + 347243085 x^49 + 521418412 x^50 + 782959178 x^51 + 1175687433 x^52 + 1765406140 x^53 + 2650924686 x^54 + 3980614733 x^55 + 5977270398 x^56 + O(x^57) (Taylor series)
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