P1st Q1st even
[1,] 0 0 1
[2,] 4 5 6
[3,] 26 27 13
[4,] 84 83 23
[5,] 203 197 35
[6,] 413 398 50
[7,] 751 722 67
[8,] 1259 1210 87
[9,] 1986 1910 109
[10,] 2986 2875 134
[11,] 4320 4165 161
[12,] 6054 5845 191
[13,] 8261 7987 223
[14,] 11019 10668 258
[15,] 14413 13972 295
[16,] 18533 17988 335
[17,] 23476 22812 377
[18,] 29344 28545 422
[19,] 36246 35295 469
[20,] 44296 43175 519

Table[(12n^4+28n^3-42n^2-52n-3(-1)^n+51)/48,{n,1,20}]

Table[(12n^4+20n^3-18n^2-20n-3(-1)^n+3)/48,{n,1,20}]

Table[(10n^2+8n+(-1)^n-9)/8,{n,1,20}]