# A019542 (b-file synthesized from sequence entry) 0 2 1 4 2 32 3 8 4 15 5 64 6 63 7 16 8 32 9 128 10 4096 11 31 12 31 13 4095 14 16384 15 32 16 1023 17 127 18 128 19 4096 20 299593 21 255