# A090754 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 13 4 73 5 127 6 2611 7 19993 8 55291 9 1436473 10 14004451 11 48366487 12 1584090553 13 2599545379 14 74472090481 15 2865429498961 16 2948475507877 17 178482956754811 18 7823019065848003 19 118402856414023933 20 88402610721571141