# A151371 (b-file synthesized from sequence entry) 0 1 1 0 2 2 3 4 4 16 5 64 6 266 7 1210 8 5630 9 27338 10 136182 11 695270 12 3622134 13 19202912 14 103375978 15 564014502 16 3114100008 17 17377324802 18 97897946434 19 556290574936 20 3185821992528 21 18375238184570 22 106677854854822 23 623039452424644 24 3658928077976048 25 21597785683494184 26 128091748188993146 27 763037745974345554