# A059138 (b-file synthesized from sequence entry) 0 18 1 90 2 270 3 666 4 1494 5 3186 6 6606 7 13482 8 27270 9 54882 10 110142 11 220698 12 441846 13 884178 14 1768878 15 3538314 16 7077222 17 14155074 18 28310814 19 56622330 20 113245398 21 226491570 22 452983950 23 905968746 24 1811938374 25 3623877666 26 7247756286 27 14495513562 28 28991028150