Alternating Engel expansion of Pi.

Terms

a(0) =3a(1) =7a(2) =112a(3) =115a(4) =157a(5) =372a(6) =432a(7) =1340a(8) =7034a(9) =8396a(10) =9200a(11) =18846a(12) =29558a(13) =34050a(14) =89754a(15) =101768a(16) =1361737a(17) =48461857a(18) =81164005a(19) =145676139a(20) =163820009a(21) =182446527a(22) =5021656281a(23) =8401618827a(24) =22255558907