# A131495 (b-file synthesized from sequence entry) 1 1 2 10 3 19 4 100 5 278 6 1000 7 10000 8 100000 9 486935 10 1000000 11 4747520 12 10000000 13 100000000 14 112033551 15 181695081 16 499895124 17 979848425 18 1000000000 19 10000000000 20 19412627434 21 100000000000